Alright, let's work through 4139 times 3723 step by step
4139 × 3723 = 3723 × (4139)
+ 3723 × 9 resulting in 33507
+ 3723 × 30 which equals 111690
+ 3723 × 100 what gives us 372300
+ 3723 × 4000 giving us 14892000

= 15409497
