We look at the division of 644209 by 72 
We're looking to find how many times 72 goes into 644209.

On to step 1:
72 can be fit into 6 0 times, resulting in a remainder of 6.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 6 after subtracting 0 from 6.
Take the next digit (4) from the dividend and append it to 6, then repeat: 64 / 72

On to step 2:
64 divided by 72 is 0 with a remainder of 64.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 64 to get 64.
Append the next digit (4) from the dividend to 64 and continue with: 644 / 72

On to step 3:
72 can be fit into 644 8 times, resulting in a remainder of 68.
Put 8 as the next digit of the answer. 
Result so far: 8.0
Subtract 576 from 644 to get 68.
Take the next digit (2) from the dividend and append it to 68, then repeat: 682 / 72

Advancing to step 4:
If we divide 682 by 72, we get 9 and a remainder of 34.
Use 9 as the next digit of our solution. 
Result so far: 89.0
Deduct 648 from 682 and we're left with 34.
Fetch the next digit (0) from the dividend, attach it to 34 and continue: 340 / 72

Going ahead to step 5:
72 goes into 340 4 times with a remainder of 52.
Write down 4 as next digit of the result. 
Result so far: 894.0
Deduct 288 from 340 and we're left with 52.
Fetch the next digit (9) from the dividend, attach it to 52 and continue: 529 / 72

Moving on to step 6:
72 can be fit into 529 7 times, resulting in a remainder of 25.
The number 7 becomes the next digit in our result. 
Result so far: 8947.0
If we take 504 away from 529, we end up with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

On to step 7:
The number 72 fits into 250 3 times, leaving a remainder of 34.
The number 3 becomes the next digit in our result. 
Result so far: 8947.3
Subtracting 216 from 250 leaves us with 34.
Since there are no more digits in the dividend, we add a zero to the remainder making it 340, and continue the process.

On to step 8:
72 can be fit into 340 4 times, resulting in a remainder of 52.
Record the quotient 4 as the next digit in the result. 
Result so far: 8947.34
Subtract 288 from 340 to get 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

Let's proceed to step 9:
520 divided by 72 is 7 with a remainder of 16.
Use 7 as the next digit of our solution. 
Result so far: 8947.347
If we subtract 504 from 520, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

On to step 10:
72 can be fit into 160 2 times, resulting in a remainder of 16.
Write down 2 as next digit of the result. 
Result so far: 8947.3472
If we subtract 144 from 160, we get 16.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Moving on to step 11:
72 goes into 160 2 times with a remainder of 16.
Put 2 as the next digit of the answer. 
Result so far: 8947.34722
The remainder is 16 after subtracting 144 from 160.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

The final outcome is 8947.34722, with a leftover of 1.6e-05.