72398840 divided by 321 
Let's see how many times 321 fits into 72398840.

On to step 1:
321 goes into 7 0 times with a remainder of 7.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
Subtracting 0 from 7 leaves us with 7.
Grab the next digit (2) from the dividend, add it to 7, then carry on: 72 / 321

Advancing to step 2:
321 goes into 72 0 times with a remainder of 72.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 72 and we're left with 72.
Take the next digit (3) from the dividend and append it to 72, then repeat: 723 / 321

On to step 3:
The number 321 fits into 723 2 times, leaving a remainder of 81.
Record the quotient 2 as the next digit in the result. 
Result so far: 2.0
Deduct 642 from 723 and we're left with 81.
Include the next digit (9) from the dividend after 81, then repeat: 819 / 321

On to step 4:
The number 321 fits into 819 2 times, leaving a remainder of 177.
Write down 2 as next digit of the result. 
Result so far: 22.0
Deduct 642 from 819 and we're left with 177.
Append the next digit (8) from the dividend to 177 and continue with: 1778 / 321

On to step 5:
If we divide 1778 by 321, we get 5 and a remainder of 173.
Put 5 as the next digit of the answer. 
Result so far: 225.0
The remainder is 173 after subtracting 1605 from 1778.
Fetch the next digit (8) from the dividend, attach it to 173 and continue: 1738 / 321

Let's proceed to step 6:
1738 divided by 321 is 5 with a remainder of 133.
The number 5 becomes the next digit in our result. 
Result so far: 2255.0
The remainder is 133 after subtracting 1605 from 1738.
Include the next digit (4) from the dividend after 133, then repeat: 1334 / 321

Going ahead to step 7:
321 can be fit into 1334 4 times, resulting in a remainder of 50.
The next digit of our result is 4. 
Result so far: 22554.0
If we take 1284 away from 1334, we end up with 50.
Take the next digit (0) from the dividend and append it to 50, then repeat: 500 / 321

Advancing to step 8:
When dividing 500 by 321, we get 1 with a remainder of 179.
Put 1 as the next digit of the answer. 
Result so far: 225541.0
Subtract 321 from 500 to get 179.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1790, and continue the process.

Step 9:
If we divide 1790 by 321, we get 5 and a remainder of 185.
Put 5 as the next digit of the answer. 
Result so far: 225541.5
Deduct 1605 from 1790 and we're left with 185.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1850, and continue the process.

Going ahead to step 10:
When dividing 1850 by 321, we get 5 with a remainder of 245.
The number 5 becomes the next digit in our result. 
Result so far: 225541.55
The remainder is 245 after subtracting 1605 from 1850.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2450, and continue the process.

The final outcome is 225541.55, with a leftover of 0.245.