Alright, let's work through 4205 times 3620 step by step
4205 × 3620 = 3620 × (4205)
+ 3620 × 5 giving us 18100
+ 3620 × 00 giving us 0
+ 3620 × 200 that results in 724000
+ 3620 × 4000 that equals 14480000

= 15222100
