We're dividing 90210718 by 391 
Our goal is to divide 90210718 by 391.

Moving on to step 1:
391 can be fit into 9 0 times, resulting in a remainder of 9.
The next digit of our result is 0. 
Result so far: 0.0
Subtracting 0 from 9 leaves us with 9.
Bring next digit (0) of the dividend behind the 9 and repeat the process: 90 / 391

Step 2:
If we divide 90 by 391, we get 0 and a remainder of 90.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 90 leaves us with 90.
Bring next digit (2) of the dividend behind the 90 and repeat the process: 902 / 391

Going ahead to step 3:
When dividing 902 by 391, we get 2 with a remainder of 120.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
The remainder is 120 after subtracting 782 from 902.
Take the next digit (1) from the dividend and append it to 120, then repeat: 1201 / 391

Advancing to step 4:
When dividing 1201 by 391, we get 3 with a remainder of 28.
Record the quotient 3 as the next digit in the result. 
Result so far: 23.0
If we take 1173 away from 1201, we end up with 28.
Take the next digit (0) from the dividend and append it to 28, then repeat: 280 / 391

Going ahead to step 5:
280 divided by 391 is 0 with a remainder of 280.
Write down 0 as next digit of the result. 
Result so far: 230.0
If we take 0 away from 280, we end up with 280.
Take the next digit (7) from the dividend and append it to 280, then repeat: 2807 / 391

Moving on to step 6:
When dividing 2807 by 391, we get 7 with a remainder of 70.
Record the quotient 7 as the next digit in the result. 
Result so far: 2307.0
Subtracting 2737 from 2807 leaves us with 70.
Append the next digit (1) from the dividend to 70 and continue with: 701 / 391

Going ahead to step 7:
If we divide 701 by 391, we get 1 and a remainder of 310.
Use 1 as the next digit of our solution. 
Result so far: 23071.0
If we take 391 away from 701, we end up with 310.
Take the next digit (8) from the dividend and append it to 310, then repeat: 3108 / 391

Advancing to step 8:
If we divide 3108 by 391, we get 7 and a remainder of 371.
The number 7 becomes the next digit in our result. 
Result so far: 230717.0
Subtract 2737 from 3108 to get 371.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3710, and continue the process.

Going ahead to step 9:
The number 391 fits into 3710 9 times, leaving a remainder of 191.
The number 9 becomes the next digit in our result. 
Result so far: 230717.9
Subtract 3519 from 3710 to get 191.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1910, and continue the process.

Advancing to step 10:
391 can be fit into 1910 4 times, resulting in a remainder of 346.
The number 4 becomes the next digit in our result. 
Result so far: 230717.94
Deduct 1564 from 1910 and we're left with 346.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3460, and continue the process.

Step 11:
3460 divided by 391 is 8 with a remainder of 332.
The next digit of our result is 8. 
Result so far: 230717.948
Subtracting 3128 from 3460 leaves us with 332.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3320, and continue the process.

Moving on to step 12:
If we divide 3320 by 391, we get 8 and a remainder of 192.
Put 8 as the next digit of the answer. 
Result so far: 230717.9488
Deduct 3128 from 3320 and we're left with 192.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1920, and continue the process.

The final result is 230717.9488 with a remainder of 0.00192.