Alright, let's work through 7788 times 9451 step by step
7788 × 9451 = 9451 × (7788)
+ 9451 × 8 resulting in 75608
+ 9451 × 80 which equals 756080
+ 9451 × 700 giving us 6615700
+ 9451 × 7000 what gives us 66157000

= 73604388
