Alright, let's work through 91678524 times 4240104 step by step
91678524 × 4240104 = 4240104 × (91678524)
+ 4240104 × 4 which equals 16960416
+ 4240104 × 20 yielding 84802080
+ 4240104 × 500 giving us 2120052000
+ 4240104 × 8000 which equals 33920832000
+ 4240104 × 70000 resulting in 296807280000
+ 4240104 × 600000 that results in 2544062400000
+ 4240104 × 1000000 resulting in 4240104000000
+ 4240104 × 90000000 yielding 381609360000000

= 388726476326496
