Alright, let's work through 5640 times 1609 step by step
5640 × 1609 = 1609 × (5640)
+ 1609 × 0 yielding 0
+ 1609 × 40 resulting in 64360
+ 1609 × 600 giving us 965400
+ 1609 × 5000 that results in 8045000

= 9074760
