Ben bought 3 oranges for 89 cents each and 4 apples for x dollars each. He spent $7.15 for the apples and oranges.
The cost of the oranges is 3 * 89 cents = <<3*89=267>>267 cents.
The cost of the apples is 4 * x dollars = <<4*x=4x>>4x dollars.
Ben spent 267 cents + 715 cents = <<267+715=982>>982 cents.
982 cents = $<<982/100=9.82>>9.82.
So the cost of the apples is 4x = 9.82 - 2.67 = <<9.82-2.67=7.15>>7.15.
Therefore, each apple costs 7.15 / 4 = $<<7.15/4=1.7875>>1.7875. Answer: \boxed{1.7875}.