We're dividing 86398944 by 618 
Let's see how many times 618 fits into 86398944.

Moving on to step 1:
618 goes into 8 0 times with a remainder of 8.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 8 leaves us with 8.
Grab the next digit (6) from the dividend, add it to 8, then carry on: 86 / 618

Advancing to step 2:
86 divided by 618 is 0 with a remainder of 86.
The next digit of our result is 0. 
Result so far: 0.0
If we take 0 away from 86, we end up with 86.
Append the next digit (3) from the dividend to 86 and continue with: 863 / 618

On to step 3:
If we divide 863 by 618, we get 1 and a remainder of 245.
The next digit of our result is 1. 
Result so far: 1.0
Deduct 618 from 863 and we're left with 245.
Take the next digit (9) from the dividend and append it to 245, then repeat: 2459 / 618

Step 4:
If we divide 2459 by 618, we get 3 and a remainder of 605.
Write down 3 as next digit of the result. 
Result so far: 13.0
If we subtract 1854 from 2459, we get 605.
Include the next digit (8) from the dividend after 605, then repeat: 6058 / 618

Going ahead to step 5:
If we divide 6058 by 618, we get 9 and a remainder of 496.
Put 9 as the next digit of the answer. 
Result so far: 139.0
Subtract 5562 from 6058 to get 496.
Fetch the next digit (9) from the dividend, attach it to 496 and continue: 4969 / 618

On to step 6:
618 goes into 4969 8 times with a remainder of 25.
Put 8 as the next digit of the answer. 
Result so far: 1398.0
Subtracting 4944 from 4969 leaves us with 25.
Include the next digit (4) from the dividend after 25, then repeat: 254 / 618

Let's proceed to step 7:
254 divided by 618 is 0 with a remainder of 254.
The next digit of our result is 0. 
Result so far: 13980.0
If we subtract 0 from 254, we get 254.
Include the next digit (4) from the dividend after 254, then repeat: 2544 / 618

Let's proceed to step 8:
The number 618 fits into 2544 4 times, leaving a remainder of 72.
Write down 4 as next digit of the result. 
Result so far: 139804.0
The remainder is 72 after subtracting 2472 from 2544.
Since there are no more digits in the dividend, we add a zero to the remainder making it 720, and continue the process.

On to step 9:
618 goes into 720 1 times with a remainder of 102.
Write down 1 as next digit of the result. 
Result so far: 139804.1
Subtracting 618 from 720 leaves us with 102.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1020, and continue the process.

Let's proceed to step 10:
The number 618 fits into 1020 1 times, leaving a remainder of 402.
Put 1 as the next digit of the answer. 
Result so far: 139804.11
Subtracting 618 from 1020 leaves us with 402.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4020, and continue the process.

The final outcome is 139804.11, with a leftover of 0.402.