399258 divided by 19 
Let's see how many times 19 fits into 399258.

On to step 1:
If we divide 3 by 19, we get 0 and a remainder of 3.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Fetch the next digit (9) from the dividend, attach it to 3 and continue: 39 / 19

Moving on to step 2:
39 divided by 19 is 2 with a remainder of 1.
Put 2 as the next digit of the answer. 
Result so far: 2.0
If we subtract 38 from 39, we get 1.
Bring next digit (9) of the dividend behind the 1 and repeat the process: 19 / 19

On to step 3:
When dividing 19 by 19, we get 1 with a remainder of 0.
Write down 1 as next digit of the result. 
Result so far: 21.0
The remainder is 0 after subtracting 19 from 19.
Fetch the next digit (2) from the dividend, attach it to 0 and continue: 2 / 19

Advancing to step 4:
19 can be fit into 2 0 times, resulting in a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 210.0
The remainder is 2 after subtracting 0 from 2.
Bring next digit (5) of the dividend behind the 2 and repeat the process: 25 / 19

Going ahead to step 5:
When dividing 25 by 19, we get 1 with a remainder of 6.
Use 1 as the next digit of our solution. 
Result so far: 2101.0
If we subtract 19 from 25, we get 6.
Append the next digit (8) from the dividend to 6 and continue with: 68 / 19

Moving on to step 6:
68 divided by 19 is 3 with a remainder of 11.
Write down 3 as next digit of the result. 
Result so far: 21013.0
Deduct 57 from 68 and we're left with 11.
Since there are no more digits in the dividend, we add a zero to the remainder making it 110, and continue the process.

On to step 7:
19 can be fit into 110 5 times, resulting in a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 21013.5
Subtracting 95 from 110 leaves us with 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Step 8:
19 can be fit into 150 7 times, resulting in a remainder of 17.
Write down 7 as next digit of the result. 
Result so far: 21013.57
If we take 133 away from 150, we end up with 17.
Since there are no more digits in the dividend, we add a zero to the remainder making it 170, and continue the process.

Going ahead to step 9:
The number 19 fits into 170 8 times, leaving a remainder of 18.
Use 8 as the next digit of our solution. 
Result so far: 21013.578
Subtracting 152 from 170 leaves us with 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Let's proceed to step 10:
When dividing 180 by 19, we get 9 with a remainder of 9.
Put 9 as the next digit of the answer. 
Result so far: 21013.5789
The remainder is 9 after subtracting 171 from 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Let's proceed to step 11:
The number 19 fits into 90 4 times, leaving a remainder of 14.
Use 4 as the next digit of our solution. 
Result so far: 21013.57894
The remainder is 14 after subtracting 76 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 12:
140 divided by 19 is 7 with a remainder of 7.
Write down 7 as next digit of the result. 
Result so far: 21013.578947
Subtract 133 from 140 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.

On to step 13:
70 divided by 19 is 3 with a remainder of 13.
Record the quotient 3 as the next digit in the result. 
Result so far: 21013.5789473
If we subtract 57 from 70, 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.

Step 14:
The number 19 fits into 130 6 times, leaving a remainder of 16.
Record the quotient 6 as the next digit in the result. 
Result so far: 21013.57894736
The remainder is 16 after subtracting 114 from 130.
Since there are no more digits in the dividend, we add a zero to the remainder making it 160, and continue the process.

Our division results in 21013.57894736 with a remaining 1.6e-08.