Alright, let's work through 42203287 times 9781086 step by step
42203287 × 9781086 = 9781086 × (42203287)
+ 9781086 × 7 that is equal 68467602
+ 9781086 × 80 producing 782486880
+ 9781086 × 200 giving us 1956217200
+ 9781086 × 3000 what gives us 29343258000
+ 9781086 × 00000 that equals 0
+ 9781086 × 200000 what gives us 1956217200000
+ 9781086 × 2000000 that is equal 19562172000000
+ 9781086 × 40000000 that is equal 391243440000000

= 412793979629682
