Alright, let's work through 4139 times 817 step by step
4139 × 817 = 817 × (4139)
+ 817 × 9 that equals 7353
+ 817 × 30 resulting in 24510
+ 817 × 100 which equals 81700
+ 817 × 4000 resulting in 3268000

= 3381563
