Alright, let's work through 5131 times 7777 step by step
5131 × 7777 = 7777 × (5131)
+ 7777 × 1 resulting in 7777
+ 7777 × 30 producing 233310
+ 7777 × 100 giving us 777700
+ 7777 × 5000 that results in 38885000

= 39903787
