390126 ÷ 28 
We want to divide 390126 by 28.

Advancing to step 1:
When dividing 3 by 28, we get 0 with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 3, we end up with 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 28

Advancing to step 2:
28 goes into 39 1 times with a remainder of 11.
Use 1 as the next digit of our solution. 
Result so far: 1.0
Deduct 28 from 39 and we're left with 11.
Fetch the next digit (0) from the dividend, attach it to 11 and continue: 110 / 28

Going ahead to step 3:
If we divide 110 by 28, we get 3 and a remainder of 26.
Record the quotient 3 as the next digit in the result. 
Result so far: 13.0
Subtract 84 from 110 to get 26.
Append the next digit (1) from the dividend to 26 and continue with: 261 / 28

Going ahead to step 4:
If we divide 261 by 28, we get 9 and a remainder of 9.
Put 9 as the next digit of the answer. 
Result so far: 139.0
If we subtract 252 from 261, we get 9.
Include the next digit (2) from the dividend after 9, then repeat: 92 / 28

On to step 5:
The number 28 fits into 92 3 times, leaving a remainder of 8.
Record the quotient 3 as the next digit in the result. 
Result so far: 1393.0
Subtracting 84 from 92 leaves us with 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 28

Step 6:
28 can be fit into 86 3 times, resulting in a remainder of 2.
Put 3 as the next digit of the answer. 
Result so far: 13933.0
Deduct 84 from 86 and we're left with 2.
Since there are no more digits in the dividend, we add a zero to the remainder making it 20, and continue the process.

Going ahead to step 7:
If we divide 20 by 28, we get 0 and a remainder of 20.
The next digit of our result is 0. 
Result so far: 13933.0
Deduct 0 from 20 and we're left with 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 8:
If we divide 200 by 28, we get 7 and a remainder of 4.
Record the quotient 7 as the next digit in the result. 
Result so far: 13933.07
The remainder is 4 after subtracting 196 from 200.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Going ahead to step 9:
40 divided by 28 is 1 with a remainder of 12.
Use 1 as the next digit of our solution. 
Result so far: 13933.071
If we take 28 away from 40, we end up with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 10:
120 divided by 28 is 4 with a remainder of 8.
Write down 4 as next digit of the result. 
Result so far: 13933.0714
Deduct 112 from 120 and we're left with 8.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Let's proceed to step 11:
28 goes into 80 2 times with a remainder of 24.
The number 2 becomes the next digit in our result. 
Result so far: 13933.07142
If we take 56 away from 80, we end up with 24.
Since there are no more digits in the dividend, we add a zero to the remainder making it 240, and continue the process.

Advancing to step 12:
28 can be fit into 240 8 times, resulting in a remainder of 16.
The next digit of our result is 8. 
Result so far: 13933.071428
Subtract 224 from 240 to 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.

Advancing to step 13:
When dividing 160 by 28, we get 5 with a remainder of 20.
The number 5 becomes the next digit in our result. 
Result so far: 13933.0714285
If we subtract 140 from 160, we get 20.
Since there are no more digits in the dividend, we add a zero to the remainder making it 200, and continue the process.

Step 14:
The number 28 fits into 200 7 times, leaving a remainder of 4.
The number 7 becomes the next digit in our result. 
Result so far: 13933.07142857
Subtracting 196 from 200 leaves us 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.

The final result is 13933.07142857 with a remainder of 4e-09.