Alright, let's work through 4239 times 9621 step by step
4239 × 9621 = 9621 × (4239)
+ 9621 × 9 yielding 86589
+ 9621 × 30 yielding 288630
+ 9621 × 200 that is equal 1924200
+ 9621 × 4000 which equals 38484000

= 40783419
