We're dividing 72489116 by 521 
We want to figure out the number of times 72489116 can be divided by 521.

On to step 1:
The number 521 fits into 7 0 times, leaving a remainder of 7.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Bring next digit (2) of the dividend behind the 7 and repeat the process: 72 / 521

On to step 2:
521 can be fit into 72 0 times, resulting in a remainder of 72.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
The remainder is 72 after subtracting 0 from 72.
Take the next digit (4) from the dividend and append it to 72, then repeat: 724 / 521

Moving on to step 3:
724 divided by 521 is 1 with a remainder of 203.
Write down 1 as next digit of the result. 
Result so far: 1.0
The remainder is 203 after subtracting 521 from 724.
Include the next digit (8) from the dividend after 203, then repeat: 2038 / 521

Going ahead to step 4:
When dividing 2038 by 521, we get 3 with a remainder of 475.
Put 3 as the next digit of the answer. 
Result so far: 13.0
Subtract 1563 from 2038 to get 475.
Bring next digit (9) of the dividend behind the 475 and repeat the process: 4759 / 521

Advancing to step 5:
When dividing 4759 by 521, we get 9 with a remainder of 70.
Write down 9 as next digit of the result. 
Result so far: 139.0
If we subtract 4689 from 4759, we get 70.
Bring next digit (1) of the dividend behind the 70 and repeat the process: 701 / 521

Moving on to step 6:
701 divided by 521 is 1 with a remainder of 180.
The number 1 becomes the next digit in our result. 
Result so far: 1391.0
If we take 521 away from 701, we end up with 180.
Bring next digit (1) of the dividend behind the 180 and repeat the process: 1801 / 521

Step 7:
521 goes into 1801 3 times with a remainder of 238.
Write down 3 as next digit of the result. 
Result so far: 13913.0
Subtracting 1563 from 1801 leaves us with 238.
Fetch the next digit (6) from the dividend, attach it to 238 and continue: 2386 / 521

Moving on to step 8:
The number 521 fits into 2386 4 times, leaving a remainder of 302.
The next digit of our result is 4. 
Result so far: 139134.0
Deduct 2084 from 2386 and we're left with 302.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3020, and continue the process.

Advancing to step 9:
521 can be fit into 3020 5 times, resulting in a remainder of 415.
The number 5 becomes the next digit in our result. 
Result so far: 139134.5
Subtracting 2605 from 3020 leaves us with 415.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4150, and continue the process.

On to step 10:
The number 521 fits into 4150 7 times, leaving a remainder of 503.
Put 7 as the next digit of the answer. 
Result so far: 139134.57
Deduct 3647 from 4150 and we're left with 503.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5030, and continue the process.

On to step 11:
If we divide 5030 by 521, we get 9 and a remainder of 341.
Write down 9 as next digit of the result. 
Result so far: 139134.579
The remainder is 341 after subtracting 4689 from 5030.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3410, and continue the process.

Advancing to step 12:
If we divide 3410 by 521, we get 6 and a remainder of 284.
The number 6 becomes the next digit in our result. 
Result so far: 139134.5796
The remainder is 284 after subtracting 3126 from 3410.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2840, and continue the process.

Advancing to step 13:
The number 521 fits into 2840 5 times, leaving a remainder of 235.
Put 5 as the next digit of the answer. 
Result so far: 139134.57965
Subtract 2605 from 2840 to get 235.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2350, and continue the process.

Going ahead to step 14:
521 goes into 2350 4 times with a remainder of 266.
Write down 4 as next digit of the result. 
Result so far: 139134.579654
Subtracting 2084 from 2350 leaves us with 266.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2660, and continue the process.

Step 15:
When dividing 2660 by 521, we get 5 with a remainder of 55.
Record the quotient 5 as the next digit in the result. 
Result so far: 139134.5796545
If we subtract 2605 from 2660, we get 55.
Since there are no more digits in the dividend, we add a zero to the remainder making it 550, and continue the process.

Let's proceed to step 16:
521 can be fit into 550 1 times, resulting in a remainder of 29.
Use 1 as the next digit of our solution. 
Result so far: 139134.57965451
Deduct 521 from 550 and we're left with 29.
Since there are no more digits in the dividend, we add a zero to the remainder making it 290, and continue the process.

The final outcome is 139134.57965451, with a leftover of 2.9e-08.