We're dividing 428421 by 31 
Our goal is to divide 428421 by 31.

Advancing to step 1:
When dividing 4 by 31, we get 0 with a remainder of 4.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 4, we end up with 4.
Fetch the next digit (2) from the dividend, attach it to 4 and continue: 42 / 31

Moving on to step 2:
If we divide 42 by 31, we get 1 and a remainder of 11.
The number 1 becomes the next digit in our result. 
Result so far: 1.0
If we subtract 31 from 42, we get 11.
Take the next digit (8) from the dividend and append it to 11, then repeat: 118 / 31

Advancing to step 3:
When dividing 118 by 31, we get 3 with a remainder of 25.
Write down 3 as next digit of the result. 
Result so far: 13.0
Deduct 93 from 118 and we're left with 25.
Bring next digit (4) of the dividend behind the 25 and repeat the process: 254 / 31

Let's proceed to step 4:
When dividing 254 by 31, we get 8 with a remainder of 6.
Use 8 as the next digit of our solution. 
Result so far: 138.0
If we take 248 away from 254, we end up with 6.
Include the next digit (2) from the dividend after 6, then repeat: 62 / 31

Advancing to step 5:
31 goes into 62 2 times with a remainder of 0.
Record the quotient 2 as the next digit in the result. 
Result so far: 1382.0
Subtract 62 from 62 to get 0.
Include the next digit (1) from the dividend after 0, then repeat: 1 / 31

Step 6:
If we divide 1 by 31, we get 0 and a remainder of 1.
The next digit of our result is 0. 
Result so far: 13820.0
Subtracting 0 from 1 leaves us with 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 7:
10 divided by 31 is 0 with a remainder of 10.
The next digit of our result is 0. 
Result so far: 13820.0
If we take 0 away from 10, we end up 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.

On to step 8:
The number 31 fits into 100 3 times, leaving a remainder of 7.
Record the quotient 3 as the next digit in the result. 
Result so far: 13820.03
Subtract 93 from 100 to get 7.
Since there are no more digits in the dividend, we add a zero to the remainder making it 70, and continue the process.

Step 9:
31 can be fit into 70 2 times, resulting in a remainder of 8.
Put 2 as the next digit of the answer. 
Result so far: 13820.032
The remainder is 8 after subtracting 62 from 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 80, and continue the process.

Going ahead to step 10:
80 divided by 31 is 2 with a remainder of 18.
The next digit of our result is 2. 
Result so far: 13820.0322
The remainder is 18 after subtracting 62 from 80.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

The final outcome is 13820.0322, with a leftover of 0.00018.