Exhibit 12(b)
                  Aon Corporation and Consolidated Subsidiaries
                    Combined With Unconsolidated Subsidiaries
           Computation of Ratio of Earnings to Combined Fixed Charges
                          and Preferred Stock Dividends


                                                    Nine Months
                                                  Ended Sept. 30,                Years Ended December 31,
                                                 -----------------   -----------------------------------------------

(millions except ratios)                          1997      1996      1996      1995      1994      1993      1992(1)
                                                 -------   -------   -------   -------   -------   -------   -------
                                                                                            
Income from continuing operations
  before provision for income taxes (2)          $ 344.9   $ 374.9   $ 445.6   $ 458.0   $ 397.0   $ 331.6   $ 179.1


Add back fixed charges:

Interest on indebtedness                            49.3      32.9      44.7      55.5      46.4      42.3      41.9

Interest on ESOP                                     2.8       3.5       4.3       5.3       5.9       6.5       6.9

Portion of rents representative of
  interest factor                                   44.2      20.0      28.6      21.4      28.7      26.1      19.2
                                                 -------   -------   -------   -------   -------   -------   -------

Income as adjusted                               $ 441.2   $ 431.3   $ 523.2   $ 540.2   $ 478.0   $ 406.5   $ 247.1
                                                 =======   =======   =======   =======   =======   =======   =======

Fixed charges and preferred stock dividends:

Interest on indebtedness                         $  49.3   $  32.9   $  44.7   $  55.5   $  46.4   $  42.3   $  41.9

Preferred stock dividends                           63.6      23.2      28.7      37.5      48.4      47.5      20.3
                                                 -------   -------   -------   -------   -------   -------   -------

Interest and dividends                             112.9      56.1      73.4      93.0      94.8      89.8      62.2

Interest on ESOP                                     2.8       3.5       4.3       5.3       5.9       6.5       6.9

Portion of rents representative of
  interest factor                                   44.2      20.0      28.6      21.4      28.7      26.1      19.2
                                                 -------   -------   -------   -------   -------   -------   -------

Total fixed charges and preferred
  stock dividends                                $ 159.9   $  79.6   $ 106.3   $ 119.7   $ 129.4   $ 122.4   $  88.3
                                                 =======   =======   =======   =======   =======   =======   =======

Ratio of earnings to combined fixed
  charges and preferred stock dividends (3)          2.8       5.4       4.9       4.5       3.7       3.3       2.8
                                                 =======   =======   =======   =======   =======   =======   =======

Ratio of earnings to combined fixed
  charges and preferred stock dividends (4)          3.8       5.8       5.8                                     3.8
                                                 =======   =======   =======                                 =======

<FN>
(1)  Income  from  continuing  operations  before  provision  for  income  taxes
     excludes the cumulative effect of changes in accounting principles.
(2)  Income from  continuing  operations  before  provision for income taxes and
     minority  interest  includes  special  charges  of $172  million  and $30.2
     million for nine months ended  September 30, 1997 and 1996,   respectively,
     and $90.5  million and $86.5  million in the years ended  December 31, 1996
     and 1992, respectively.
(3)  Included in total fixed charges and preferred  stock dividends for the nine
     months ended  September 30, 1997 are $47.6 million of pretax  distributions
     on the 8.205% trust preferred  capital  securities  which are classified as
     "minority interest" on the condensed consolidated statements of operations.
(4)  The  calculation  of this ratio of earnings to fixed  charges  reflects the
     exclusion  of special  charges from the income from  continuing  operations
     before  provision  for income  taxes  component  for the nine months  ended
     September 30, 1997 and 1996, respectively, and the years ended December 31,
     1996 and 1992, respectively.
</FN>