Alright, let's work through 5287 times 1239 step by step
5287 × 1239 = 1239 × (5287)
+ 1239 × 7 that equals 8673
+ 1239 × 80 resulting in 99120
+ 1239 × 200 giving us 247800
+ 1239 × 5000 which equals 6195000

= 6550593
