Alright, let's work through 1587 times 5803 step by step
1587 × 5803 = 5803 × (1587)
+ 5803 × 7 giving us 40621
+ 5803 × 80 producing 464240
+ 5803 × 500 that results in 2901500
+ 5803 × 1000 giving us 5803000

= 9209361
