Alright, let's work through 4187 times 9951 step by step
4187 × 9951 = 9951 × (4187)
+ 9951 × 7 resulting in 69657
+ 9951 × 80 producing 796080
+ 9951 × 100 what gives us 995100
+ 9951 × 4000 what gives us 39804000

= 41664837
