Alright, let's work through 3678 times 5378 step by step
3678 × 5378 = 5378 × (3678)
+ 5378 × 8 resulting in 43024
+ 5378 × 70 resulting in 376460
+ 5378 × 600 that results in 3226800
+ 5378 × 3000 that results in 16134000

= 19780284
