Alright, let's work through 5643 times 1553 step by step
5643 × 1553 = 1553 × (5643)
+ 1553 × 3 yielding 4659
+ 1553 × 40 that equals 62120
+ 1553 × 600 which equals 931800
+ 1553 × 5000 that results in 7765000

= 8763579
