Alright, let's work through 1087 times 9120 step by step
1087 × 9120 = 9120 × (1087)
+ 9120 × 7 yielding 63840
+ 9120 × 80 yielding 729600
+ 9120 × 000 resulting in 0
+ 9120 × 1000 what gives us 9120000

= 9913440
