Alright, let's work through 3778 times 7715 step by step
3778 × 7715 = 7715 × (3778)
+ 7715 × 8 that is equal 61720
+ 7715 × 70 resulting in 540050
+ 7715 × 700 giving us 5400500
+ 7715 × 3000 producing 23145000

= 29147270
