Alright, let's work through 5131 times 7715 step by step
5131 × 7715 = 7715 × (5131)
+ 7715 × 1 that results in 7715
+ 7715 × 30 that results in 231450
+ 7715 × 100 that results in 771500
+ 7715 × 5000 that equals 38575000

= 39585665
