Alright, let's work through 7839 times 1407 step by step
7839 × 1407 = 1407 × (7839)
+ 1407 × 9 giving us 12663
+ 1407 × 30 that results in 42210
+ 1407 × 800 producing 1125600
+ 1407 × 7000 what gives us 9849000

= 11029473
