We divide 73217280 by 18
We want to figure out the number of times 73217280 can be divided by 18.

Moving on to step 1:
If we divide 7 by 18, we get 0 and a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
Subtract 0 from 7 to get 7.
Bring next digit (3) of the dividend behind the 7 and repeat the process: 73 / 18

Step 2:
18 can be fit into 73 4 times, resulting in a remainder of 1.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we take 72 away from 73, we end up with 1.
Grab the next digit (2) from the dividend, add it to 1, then carry on: 12 / 18

Step 3:
18 can be fit into 12 0 times, resulting in a remainder of 12.
Write down 0 as next digit of the result. 
Result so far: 40.0
Subtracting 0 from 12 leaves us with 12.
Take the next digit (1) from the dividend and append it to 12, then repeat: 121 / 18

On to step 4:
When dividing 121 by 18, we get 6 with a remainder of 13.
Put 6 as the next digit of the answer. 
Result so far: 406.0
If we subtract 108 from 121, we get 13.
Append the next digit (7) from the dividend to 13 and continue with: 137 / 18

Going ahead to step 5:
If we divide 137 by 18, we get 7 and a remainder of 11.
The number 7 becomes the next digit in our result. 
Result so far: 4067.0
If we take 126 away from 137, we end up with 11.
Fetch the next digit (2) from the dividend, attach it to 11 and continue: 112 / 18

On to step 6:
112 divided by 18 is 6 with a remainder of 4.
The number 6 becomes the next digit in our result. 
Result so far: 40676.0
If we take 108 away from 112, we end up with 4.
Take the next digit (8) from the dividend and append it to 4, then repeat: 48 / 18

On to step 7:
48 divided by 18 is 2 with a remainder of 12.
The next digit of our result is 2. 
Result so far: 406762.0
If we subtract 36 from 48, we get 12.
Take the next digit (0) from the dividend and append it to 12, then repeat: 120 / 18

Moving on to step 8:
The number 18 fits into 120 6 times, leaving a remainder of 12.
The number 6 becomes the next digit in our result. 
Result so far: 4067626.0
The remainder is 12 after subtracting 108 from 120.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

On to step 9:
120 divided by 18 is 6 with a remainder of 12.
Record the quotient 6 as the next digit in the result. 
Result so far: 4067626.6
Subtract 108 from 120 to get 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

Step 10:
If we divide 120 by 18, we get 6 and a remainder of 12.
Record the quotient 6 as the next digit in the result. 
Result so far: 4067626.66
Subtracting 108 from 120 leaves us with 12.
Since there are no more digits in the dividend, we add a zero to the remainder making it 120, and continue the process.

The final result is 4067626.66 with a remainder of 0.012.