Alright, let's work through 78728917 times 61184082 step by step
78728917 × 61184082 = 61184082 × (78728917)
+ 61184082 × 7 producing 428288574
+ 61184082 × 10 producing 611840820
+ 61184082 × 900 producing 55065673800
+ 61184082 × 8000 giving us 489472656000
+ 61184082 × 20000 resulting in 1223681640000
+ 61184082 × 700000 yielding 42828857400000
+ 61184082 × 8000000 which equals 489472656000000
+ 61184082 × 70000000 yielding 4282885740000000

= 4816956513499194
