We're dividing 39406486 by 455 
Let's see how many times 455 fits into 39406486.

On to step 1:
455 goes into 3 0 times with a remainder of 3.
The next digit of our result is 0. 
Result so far: 0.0
The remainder is 3 after subtracting 0 from 3.
Grab the next digit (9) from the dividend, add it to 3, then carry on: 39 / 455

Going ahead to step 2:
455 can be fit into 39 0 times, resulting in a remainder of 39.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtract 0 from 39 to get 39.
Bring next digit (4) of the dividend behind the 39 and repeat the process: 394 / 455

Moving on to step 3:
455 can be fit into 394 0 times, resulting in a remainder of 394.
Use 0 as the next digit of our solution. 
Result so far: 0.0
The remainder is 394 after subtracting 0 from 394.
Fetch the next digit (0) from the dividend, attach it to 394 and continue: 3940 / 455

Going ahead to step 4:
If we divide 3940 by 455, we get 8 and a remainder of 300.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
The remainder is 300 after subtracting 3640 from 3940.
Bring next digit (6) of the dividend behind the 300 and repeat the process: 3006 / 455

Going ahead to step 5:
455 goes into 3006 6 times with a remainder of 276.
Write down 6 as next digit of the result. 
Result so far: 86.0
Deduct 2730 from 3006 and we're left with 276.
Include the next digit (4) from the dividend after 276, then repeat: 2764 / 455

Going ahead to step 6:
2764 divided by 455 is 6 with a remainder of 34.
The next digit of our result is 6. 
Result so far: 866.0
If we subtract 2730 from 2764, we get 34.
Grab the next digit (8) from the dividend, add it to 34, then carry on: 348 / 455

Moving on to step 7:
348 divided by 455 is 0 with a remainder of 348.
Write down 0 as next digit of the result. 
Result so far: 8660.0
If we subtract 0 from 348, we get 348.
Take the next digit (6) from the dividend and append it to 348, then repeat: 3486 / 455

Advancing to step 8:
The number 455 fits into 3486 7 times, leaving a remainder of 301.
The number 7 becomes the next digit in our result. 
Result so far: 86607.0
Subtracting 3185 from 3486 leaves us with 301.
Since there are no more digits in the dividend, we add a zero to the remainder making it 3010, and continue the process.

Advancing to step 9:
The number 455 fits into 3010 6 times, leaving a remainder of 280.
Write down 6 as next digit of the result. 
Result so far: 86607.6
If we take 2730 away from 3010, we end up with 280.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2800, and continue the process.

Step 10:
The number 455 fits into 2800 6 times, leaving a remainder of 70.
Put 6 as the next digit of the answer. 
Result so far: 86607.66
If we subtract 2730 from 2800, we get 70.
Since there are no more digits in the dividend, we add a zero to the remainder making it 700, and continue the process.

The final outcome is 86607.66, with a leftover of 0.07.