Alright, let's work through 7839 times 8457 step by step
7839 × 8457 = 8457 × (7839)
+ 8457 × 9 which equals 76113
+ 8457 × 30 that results in 253710
+ 8457 × 800 giving us 6765600
+ 8457 × 7000 what gives us 59199000

= 66294423
