We're dividing 403889 by 15 
Our goal is to divide 403889 by 15.

Let's proceed to step 1:
15 goes into 4 0 times with a remainder of 4.
The next digit of our result is 0. 
Result so far: 0.0
Deduct 0 from 4 and we're left with 4.
Bring next digit (0) of the dividend behind the 4 and repeat the process: 40 / 15

On to step 2:
15 goes into 40 2 times with a remainder of 10.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Subtracting 30 from 40 leaves us with 10.
Bring next digit (3) of the dividend behind the 10 and repeat the process: 103 / 15

Going ahead to step 3:
The number 15 fits into 103 6 times, leaving a remainder of 13.
The number 6 becomes the next digit in our result. 
Result so far: 26.0
If we subtract 90 from 103, we get 13.
Bring next digit (8) of the dividend behind the 13 and repeat the process: 138 / 15

Going ahead to step 4:
If we divide 138 by 15, we get 9 and a remainder of 3.
Write down 9 as next digit of the result. 
Result so far: 269.0
Subtract 135 from 138 to get 3.
Fetch the next digit (8) from the dividend, attach it to 3 and continue: 38 / 15

Going ahead to step 5:
When dividing 38 by 15, we get 2 with a remainder of 8.
The next digit of our result is 2. 
Result so far: 2692.0
If we subtract 30 from 38, we get 8.
Take the next digit (9) from the dividend and append it to 8, then repeat: 89 / 15

On to step 6:
The number 15 fits into 89 5 times, leaving a remainder of 14.
Write down 5 as next digit of the result. 
Result so far: 26925.0
If we take 75 away from 89, we end up with 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Step 7:
If we divide 140 by 15, we get 9 and a remainder of 5.
The next digit of our result is 9. 
Result so far: 26925.9
Deduct 135 from 140 and we're left with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

Going ahead to step 8:
If we divide 50 by 15, we get 3 and a remainder of 5.
Write down 3 as next digit of the result. 
Result so far: 26925.93
Subtracting 45 from 50 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

On to step 9:
If we divide 50 by 15, we get 3 and a remainder of 5.
The number 3 becomes the next digit in our result. 
Result so far: 26925.933
Subtracting 45 from 50 leaves us with 5.
Since there are no more digits in the dividend, we add a zero to the remainder making it 50, and continue the process.

The final outcome is 26925.933, with a leftover of 0.0005.