We look at the division of 54859 by 15 
Our goal is to divide 54859 by 15.

Advancing to step 1:
15 can be fit into 5 0 times, resulting in a remainder of 5.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 5 leaves us with 5.
Take the next digit (4) from the dividend and append it to 5, then repeat: 54 / 15

Let's proceed to step 2:
The number 15 fits into 54 3 times, leaving a remainder of 9.
Use 3 as the next digit of our solution. 
Result so far: 3.0
If we subtract 45 from 54, we get 9.
Bring next digit (8) of the dividend behind the 9 and repeat the process: 98 / 15

Going ahead to step 3:
15 goes into 98 6 times with a remainder of 8.
The number 6 becomes the next digit in our result. 
Result so far: 36.0
Deduct 90 from 98 and we're left with 8.
Append the next digit (5) from the dividend to 8 and continue with: 85 / 15

Let's proceed to step 4:
The number 15 fits into 85 5 times, leaving a remainder of 10.
Record the quotient 5 as the next digit in the result. 
Result so far: 365.0
If we take 75 away from 85, we end up with 10.
Grab the next digit (9) from the dividend, add it to 10, then carry on: 109 / 15

Going ahead to step 5:
When dividing 109 by 15, we get 7 with a remainder of 4.
The number 7 becomes the next digit in our result. 
Result so far: 3657.0
Subtracting 105 from 109 leaves us with 4.
Since there are no more digits in the dividend, we add a zero to the remainder making it 40, and continue the process.

Let's proceed to step 6:
When dividing 40 by 15, we get 2 with a remainder of 10.
Put 2 as the next digit of the answer. 
Result so far: 3657.2
The remainder is 10 after subtracting 30 from 40.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 7:
When dividing 100 by 15, we get 6 with a remainder of 10.
The next digit of our result is 6. 
Result so far: 3657.26
Subtracting 90 from 100 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Moving on to step 8:
When dividing 100 by 15, we get 6 with a remainder of 10.
Put 6 as the next digit of the answer. 
Result so far: 3657.266
Subtracting 90 from 100 leaves us with 10.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

The final outcome is 3657.266, with a leftover of 0.001.