Alright, let's work through 42155134 times 78689875 step by step
42155134 × 78689875 = 78689875 × (42155134)
+ 78689875 × 4 that results in 314759500
+ 78689875 × 30 giving us 2360696250
+ 78689875 × 100 giving us 7868987500
+ 78689875 × 5000 that results in 393449375000
+ 78689875 × 50000 resulting in 3934493750000
+ 78689875 × 100000 resulting in 7868987500000
+ 78689875 × 2000000 that results in 157379750000000
+ 78689875 × 40000000 that equals 3147595000000000

= 3317182225068250
