Ok, I must admit, I've not seen such am alarming example of float mathematics going wrong before. This is kinda scary.

While I have your attention though... how do you get around the decimal rounding problem:

declare @a decimal (38,28) = 1.123456789

declare @b decimal (38,28) = 1.123456789

declare @c decimal (38,28) = 1.123456789

select @a * @b * @c

?