We're dividing 87438739 by 721 
Our goal is to divide 87438739 by 721.

Advancing to step 1:
721 goes into 8 0 times with a remainder of 8.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 8, we end up with 8.
Take the next digit (7) from the dividend and append it to 8, then repeat: 87 / 721

Let's proceed to step 2:
721 can be fit into 87 0 times, resulting in a remainder of 87.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 87, we end up with 87.
Bring next digit (4) of the dividend behind the 87 and repeat the process: 874 / 721

Going ahead to step 3:
721 can be fit into 874 1 times, resulting in a remainder of 153.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 721 from 874 and we're left with 153.
Fetch the next digit (3) from the dividend, attach it to 153 and continue: 1533 / 721

Advancing to step 4:
When dividing 1533 by 721, we get 2 with a remainder of 91.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
The remainder is 91 after subtracting 1442 from 1533.
Take the next digit (8) from the dividend and append it to 91, then repeat: 918 / 721

Moving on to step 5:
721 goes into 918 1 times with a remainder of 197.
Record the quotient 1 as the next digit in the result. 
Result so far: 121.0
Deduct 721 from 918 and we're left with 197.
Grab the next digit (7) from the dividend, add it to 197, then carry on: 1977 / 721

Let's proceed to step 6:
721 can be fit into 1977 2 times, resulting in a remainder of 535.
Put 2 as the next digit of the answer. 
Result so far: 1212.0
Deduct 1442 from 1977 and we're left with 535.
Take the next digit (3) from the dividend and append it to 535, then repeat: 5353 / 721

Step 7:
721 goes into 5353 7 times with a remainder of 306.
Write down 7 as next digit of the result. 
Result so far: 12127.0
Deduct 5047 from 5353 and we're left with 306.
Include the next digit (9) from the dividend after 306, then repeat: 3069 / 721

Let's proceed to step 8:
The number 721 fits into 3069 4 times, leaving a remainder of 185.
Write down 4 as next digit of the result. 
Result so far: 121274.0
Subtracting 2884 from 3069 leaves us with 185.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1850, and continue the process.

Moving on to step 9:
721 can be fit into 1850 2 times, resulting in a remainder of 408.
Write down 2 as next digit of the result. 
Result so far: 121274.2
Deduct 1442 from 1850 and we're left with 408.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4080, and continue the process.

Moving on to step 10:
When dividing 4080 by 721, we get 5 with a remainder of 475.
The number 5 becomes the next digit in our result. 
Result so far: 121274.25
If we take 3605 away from 4080, we end up with 475.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4750, and continue the process.

Going ahead to step 11:
If we divide 4750 by 721, we get 6 and a remainder of 424.
The next digit of our result is 6. 
Result so far: 121274.256
The remainder is 424 after subtracting 4326 from 4750.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4240, and continue the process.

Step 12:
721 goes into 4240 5 times with a remainder of 635.
The next digit of our result is 5. 
Result so far: 121274.2565
Subtract 3605 from 4240 to get 635.
Since there are no more digits in the dividend, we add a zero to the remainder making it 6350, and continue the process.

Going ahead to step 13:
The number 721 fits into 6350 8 times, leaving a remainder of 582.
The next digit of our result is 8. 
Result so far: 121274.25658
Subtract 5768 from 6350 to get 582.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5820, and continue the process.

Let's proceed to step 14:
The number 721 fits into 5820 8 times, leaving a remainder of 52.
Put 8 as the next digit of the answer. 
Result so far: 121274.256588
Deduct 5768 from 5820 and we're left with 52.
Since there are no more digits in the dividend, we add a zero to the remainder making it 520, and continue the process.

The final outcome is 121274.256588, with a leftover of 5.2e-06.