Alright, let's work through 9987 times 6172 step by step
9987 × 6172 = 6172 × (9987)
+ 6172 × 7 producing 43204
+ 6172 × 80 that equals 493760
+ 6172 × 900 producing 5554800
+ 6172 × 9000 which equals 55548000

= 61639764
