Alright, let's work through 7381 times 647 step by step
7381 × 647 = 647 × (7381)
+ 647 × 1 producing 647
+ 647 × 80 that is equal 51760
+ 647 × 300 yielding 194100
+ 647 × 7000 which equals 4529000

= 4775507
