CFAI Book5 P391 Q3C future hedging

original stock position 25million stock index: 1170 to 1031 stock dividend yield: 1.25 calculated total gain from future: 2,990,650 Combined total: 25,157,150 4 months position I don’t get how they calculated final stock value. isn’t it final stock value = 25m* (1.0125^(4/12)) * (1031/1170) Thanks!