We're going to solve 7857 multiplied by 2787
7857 × 2787 = 2787 × (7857)
+ 2787 × 7 what gives us 19509
+ 2787 × 50 giving us 139350
+ 2787 × 800 giving us 2229600
+ 2787 × 7000 yielding 19509000

= 21897459
