We're dividing 54928639 by 3 
We want to figure out the number of times 54928639 can be divided by 3.

On to step 1:
If we divide 5 by 3, we get 1 and a remainder of 2.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 3 from 5 to get 2.
Grab the next digit (4) from the dividend, add it to 2, then carry on: 24 / 3

Going ahead to step 2:
When dividing 24 by 3, we get 8 with a remainder of 0.
The next digit of our result is 8. 
Result so far: 18.0
The remainder is 0 after subtracting 24 from 24.
Include the next digit (9) from the dividend after 0, then repeat: 9 / 3

On to step 3:
If we divide 9 by 3, we get 3 and a remainder of 0.
The number 3 becomes the next digit in our result. 
Result so far: 183.0
Subtracting 9 from 9 leaves us with 0.
Append the next digit (2) from the dividend to 0 and continue with: 2 / 3

On to step 4:
3 goes into 2 0 times with a remainder of 2.
Put 0 as the next digit of the answer. 
Result so far: 1830.0
If we take 0 away from 2, we end up with 2.
Include the next digit (8) from the dividend after 2, then repeat: 28 / 3

Step 5:
3 can be fit into 28 9 times, resulting in a remainder of 1.
Use 9 as the next digit of our solution. 
Result so far: 18309.0
The remainder is 1 after subtracting 27 from 28.
Include the next digit (6) from the dividend after 1, then repeat: 16 / 3

Let's proceed to step 6:
3 can be fit into 16 5 times, resulting in a remainder of 1.
Use 5 as the next digit of our solution. 
Result so far: 183095.0
If we take 15 away from 16, we end up with 1.
Grab the next digit (3) from the dividend, add it to 1, then carry on: 13 / 3

Let's proceed to step 7:
3 goes into 13 4 times with a remainder of 1.
Write down 4 as next digit of the result. 
Result so far: 1830954.0
If we take 12 away from 13, we end up with 1.
Include the next digit (9) from the dividend after 1, then repeat: 19 / 3

On to step 8:
If we divide 19 by 3, we get 6 and a remainder of 1.
The number 6 becomes the next digit in our result. 
Result so far: 18309546.0
The remainder is 1 after subtracting 18 from 19.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 9:
3 goes into 10 3 times with a remainder of 1.
The number 3 becomes the next digit in our result. 
Result so far: 18309546.3
The remainder is 1 after subtracting 9 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

On to step 10:
If we divide 10 by 3, we get 3 and a remainder of 1.
The number 3 becomes the next digit in our result. 
Result so far: 18309546.33
The remainder is 1 after subtracting 9 from 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 10, and continue the process.

The final outcome is 18309546.33, with a leftover of 0.001.