Alright, let's work through 4539 times 1287 step by step
4539 × 1287 = 1287 × (4539)
+ 1287 × 9 yielding 11583
+ 1287 × 30 producing 38610
+ 1287 × 500 that results in 643500
+ 1287 × 4000 that equals 5148000

= 5841693
