Alright, let's work through 3791 times 1277 step by step
3791 × 1277 = 1277 × (3791)
+ 1277 × 1 yielding 1277
+ 1277 × 90 resulting in 114930
+ 1277 × 700 resulting in 893900
+ 1277 × 3000 producing 3831000

= 4841107
