We divide 21604 by 72
We're looking to find how many times 72 goes into 21604.

Going ahead to step 1:
2 divided by 72 is 0 with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Append the next digit (1) from the dividend to 2 and continue with: 21 / 72

Advancing to step 2:
If we divide 21 by 72, we get 0 and a remainder of 21.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtract 0 from 21 to get 21.
Include the next digit (6) from the dividend after 21, then repeat: 216 / 72

Going ahead to step 3:
The number 72 fits into 216 3 times, leaving a remainder of 0.
Put 3 as the next digit of the answer. 
Result so far: 3.0
The remainder is 0 after subtracting 216 from 216.
Append the next digit (0) from the dividend to 0 and continue with: 0 / 72

Advancing to step 4:
0 divided by 72 is 0 with a remainder of 0.
Use 0 as the next digit of our solution. 
Result so far: 30.0
Subtract 0 from 0 to get 0.
Append the next digit (4) from the dividend to 0 and continue with: 4 / 72

On to step 5:
When dividing 4 by 72, we get 0 with a remainder of 4.
Use 0 as the next digit of our solution. 
Result so far: 300.0
Deduct 0 from 4 and we're left with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

On to step 6:
40 divided by 72 is 0 with a remainder of 40.
Record the quotient 0 as the next digit in the result. 
Result so far: 300.0
Subtracting 0 from 40 leaves us with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Going ahead to step 7:
72 can be fit into 400 5 times, resulting in a remainder of 40.
Use 5 as the next digit of our solution. 
Result so far: 300.05
Deduct 360 from 400 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

Let's proceed to step 8:
72 goes into 400 5 times with a remainder of 40.
The next digit of our result is 5. 
Result so far: 300.055
Deduct 360 from 400 and we're left with 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 400, and continue the process.

The final result is 300.055 with a remainder of 0.004.