Alright, let's work through 4057 times 6729 step by step
4057 × 6729 = 6729 × (4057)
+ 6729 × 7 producing 47103
+ 6729 × 50 yielding 336450
+ 6729 × 000 producing 0
+ 6729 × 4000 that results in 26916000

= 27299553
