72990 ÷ 4 = 18247 R2
Alright, let's work through the division of 72990 by 4 step by step.

Step 1:
4 goes into 7 1 times with a remainder of 3.
Write down 1 as next digit of of the result. 
Result so far: 1
Subtract 4 from 7 to get 3.
Bring next digit (2) of the dividend behind the 3 and repeat the process: 32 / 4

Step 2:
4 goes into 32 8 times with a remainder of 0.
Write down 8 as next digit of of the result. 
Result so far: 18
Subtract 32 from 32 to get 0.
Bring next digit (9) of the dividend behind the 0 and repeat the process: 9 / 4

Step 3:
4 goes into 9 2 times with a remainder of 1.
Write down 2 as next digit of of the result. 
Result so far: 182
Subtract 8 from 9 to get 1.
Bring next digit (9) of the dividend behind the 1 and repeat the process: 19 / 4

Step 4:
4 goes into 19 4 times with a remainder of 3.
Write down 4 as next digit of of the result. 
Result so far: 1824
Subtract 16 from 19 to get 3.
Bring next digit (0) of the dividend behind the 3 and repeat the process: 30 / 4

Step 5:
4 goes into 30 7 times with a remainder of 2.
Write down 7 as next digit of of the result. 
Result so far: 18247
Subtract 28 from 30 to get 2.

The final result is 18247 with a remainder of 2.