72155809 ÷ 351 
Our goal is to divide 72155809 by 351.

Step 1:
7 divided by 351 is 0 with a remainder of 7.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Take the next digit (2) from the dividend and append it to 7, then repeat: 72 / 351

Advancing to step 2:
351 can be fit into 72 0 times, resulting in a remainder of 72.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Subtract 0 from 72 to get 72.
Bring next digit (1) of the dividend behind the 72 and repeat the process: 721 / 351

Step 3:
If we divide 721 by 351, we get 2 and a remainder of 19.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 702 from 721 and we're left with 19.
Bring next digit (5) of the dividend behind the 19 and repeat the process: 195 / 351

Going ahead to step 4:
195 divided by 351 is 0 with a remainder of 195.
The next digit of our result is 0. 
Result so far: 20.0
The remainder is 195 after subtracting 0 from 195.
Fetch the next digit (5) from the dividend, attach it to 195 and continue: 1955 / 351

Moving on to step 5:
If we divide 1955 by 351, we get 5 and a remainder of 200.
The number 5 becomes the next digit in our result. 
Result so far: 205.0
Subtracting 1755 from 1955 leaves us with 200.
Append the next digit (8) from the dividend to 200 and continue with: 2008 / 351

Let's proceed to step 6:
351 goes into 2008 5 times with a remainder of 253.
Record the quotient 5 as the next digit in the result. 
Result so far: 2055.0
Deduct 1755 from 2008 and we're left with 253.
Include the next digit (0) from the dividend after 253, then repeat: 2530 / 351

Going ahead to step 7:
The number 351 fits into 2530 7 times, leaving a remainder of 73.
The number 7 becomes the next digit in our result. 
Result so far: 20557.0
Deduct 2457 from 2530 and we're left with 73.
Fetch the next digit (9) from the dividend, attach it to 73 and continue: 739 / 351

Advancing to step 8:
739 divided by 351 is 2 with a remainder of 37.
The number 2 becomes the next digit in our result. 
Result so far: 205572.0
Deduct 702 from 739 and we're left with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

On to step 9:
351 goes into 370 1 times with a remainder of 19.
The next digit of our result is 1. 
Result so far: 205572.1
Subtracting 351 from 370 leaves us with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Let's proceed to step 10:
When dividing 190 by 351, we get 0 with a remainder of 190.
Use 0 as the next digit of our solution. 
Result so far: 205572.1
Subtract 0 from 190 to get 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

On to step 11:
351 can be fit into 1900 5 times, resulting in a remainder of 145.
Put 5 as the next digit of the answer. 
Result so far: 205572.105
Subtracting 1755 from 1900 leaves us with 145.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1450, and continue the process.

Step 12:
351 goes into 1450 4 times with a remainder of 46.
Write down 4 as next digit of the result. 
Result so far: 205572.1054
Subtract 1404 from 1450 to get 46.
Since there are no more digits in the dividend, we add a zero to the remainder making it 460, and continue the process.

Moving on to step 13:
When dividing 460 by 351, we get 1 with a remainder of 109.
Record the quotient 1 as the next digit in the result. 
Result so far: 205572.10541
The remainder is 109 after subtracting 351 from 460.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1090, and continue the process.

Step 14:
351 can be fit into 1090 3 times, resulting in a remainder of 37.
Write down 3 as next digit of the result. 
Result so far: 205572.105413
Deduct 1053 from 1090 and we're left with 37.
Since there are no more digits in the dividend, we add a zero to the remainder making it 370, and continue the process.

Advancing to step 15:
351 goes into 370 1 times with a remainder of 19.
Write down 1 as next digit of the result. 
Result so far: 205572.1054131
If we take 351 away from 370, we end up with 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

Step 16:
351 goes into 190 0 times with a remainder of 190.
Put 0 as the next digit of the answer. 
Result so far: 205572.1054131
Deduct 0 from 190 and we're left with 190.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1900, and continue the process.

The final outcome is 205572.1054131, with a leftover of 1.9e-07.