We're dividing 3690112 by 21 
We want to divide 3690112 by 21.

Step 1:
When dividing 3 by 21, we get 0 with a remainder of 3.
Put 0 as the next digit of the answer. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Fetch the next digit (6) from the dividend, attach it to 3 and continue: 36 / 21

On to step 2:
If we divide 36 by 21, we get 1 and a remainder of 15.
Write down 1 as next digit of the result. 
Result so far: 1.0
Deduct 21 from 36 and we're left with 15.
Take the next digit (9) from the dividend and append it to 15, then repeat: 159 / 21

Let's proceed to step 3:
If we divide 159 by 21, we get 7 and a remainder of 12.
Write down 7 as next digit of the result. 
Result so far: 17.0
If we take 147 away from 159, we end up with 12.
Append the next digit (0) from the dividend to 12 and continue with: 120 / 21

Let's proceed to step 4:
21 goes into 120 5 times with a remainder of 15.
The next digit of our result is 5. 
Result so far: 175.0
Subtracting 105 from 120 leaves us with 15.
Take the next digit (1) from the dividend and append it to 15, then repeat: 151 / 21

Going ahead to step 5:
21 can be fit into 151 7 times, resulting in a remainder of 4.
Record the quotient 7 as the next digit in the result. 
Result so far: 1757.0
If we subtract 147 from 151, we get 4.
Fetch the next digit (1) from the dividend, attach it to 4 and continue: 41 / 21

Let's proceed to step 6:
The number 21 fits into 41 1 times, leaving a remainder of 20.
The next digit of our result is 1. 
Result so far: 17571.0
If we subtract 21 from 41, we get 20.
Grab the next digit (2) from the dividend, add it to 20, then carry on: 202 / 21

Step 7:
The number 21 fits into 202 9 times, leaving a remainder of 13.
Use 9 as the next digit of our solution. 
Result so far: 175719.0
If we subtract 189 from 202, we get 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

On to step 8:
When dividing 130 by 21, we get 6 with a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 175719.6
Subtract 126 from 130 to get 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Step 9:
When dividing 40 by 21, we get 1 with a remainder of 19.
Record the quotient 1 as the next digit in the result. 
Result so far: 175719.61
Subtracting 21 from 40 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.

Step 10:
If we divide 190 by 21, we get 9 and a remainder of 1.
Record the quotient 9 as the next digit in the result. 
Result so far: 175719.619
If we subtract 189 from 190, we get 1.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 11:
21 goes into 10 0 times with a remainder of 10.
Write down 0 as next digit of the result. 
Result so far: 175719.619
Deduct 0 from 10 and we're left with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Let's proceed to step 12:
21 can be fit into 100 4 times, resulting in a remainder of 16.
The next digit of our result is 4. 
Result so far: 175719.61904
If we subtract 84 from 100, 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.

Step 13:
21 goes into 160 7 times with a remainder of 13.
The number 7 becomes the next digit in our result. 
Result so far: 175719.619047
Subtracting 147 from 160 leaves us with 13.
Since there are no more digits in the dividend, we add a zero to the remainder making it 130, and continue the process.

Let's proceed to step 14:
21 can be fit into 130 6 times, resulting in a remainder of 4.
Record the quotient 6 as the next digit in the result. 
Result so far: 175719.6190476
If we take 126 away from 130, we end up with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Moving on to step 15:
21 can be fit into 40 1 times, resulting in a remainder of 19.
Put 1 as the next digit of the answer. 
Result so far: 175719.61904761
Subtract 21 from 40 to get 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 190, and continue the process.

The final outcome is 175719.61904761, with a leftover of 1.9e-08.