We look at the division of 258544 by 15 
Let's see how many times 15 fits into 258544.

Step 1:
2 divided by 15 is 0 with a remainder of 2.
Use 0 as the next digit of our solution. 
Result so far: 0.0
Deduct 0 from 2 and we're left with 2.
Append the next digit (5) from the dividend to 2 and continue with: 25 / 15

Let's proceed to step 2:
15 can be fit into 25 1 times, resulting in a remainder of 10.
Write down 1 as next digit of the result. 
Result so far: 1.0
Subtract 15 from 25 to get 10.
Bring next digit (8) of the dividend behind the 10 and repeat the process: 108 / 15

Going ahead to step 3:
When dividing 108 by 15, we get 7 with a remainder of 3.
The number 7 becomes the next digit in our result. 
Result so far: 17.0
Deduct 105 from 108 and we're left with 3.
Fetch the next digit (5) from the dividend, attach it to 3 and continue: 35 / 15

Advancing to step 4:
When dividing 35 by 15, we get 2 with a remainder of 5.
Use 2 as the next digit of our solution. 
Result so far: 172.0
Deduct 30 from 35 and we're left with 5.
Append the next digit (4) from the dividend to 5 and continue with: 54 / 15

Advancing to step 5:
54 divided by 15 is 3 with a remainder of 9.
Use 3 as the next digit of our solution. 
Result so far: 1723.0
The remainder is 9 after subtracting 45 from 54.
Bring next digit (4) of the dividend behind the 9 and repeat the process: 94 / 15

Advancing to step 6:
15 can be fit into 94 6 times, resulting in a remainder of 4.
Use 6 as the next digit of our solution. 
Result so far: 17236.0
If we take 90 away from 94, we end up 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 7:
15 goes into 40 2 times with a remainder of 10.
The next digit of our result is 2. 
Result so far: 17236.2
Subtracting 30 from 40 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.

On to step 8:
The number 15 fits into 100 6 times, leaving a remainder of 10.
Record the quotient 6 as the next digit in the result. 
Result so far: 17236.26
The remainder is 10 after subtracting 90 from 100.
Since there are no more digits in the dividend, we add a zero to the remainder making it 100, and continue the process.

Going ahead to step 9:
100 divided by 15 is 6 with a remainder of 10.
Use 6 as the next digit of our solution. 
Result so far: 17236.266
If we take 90 away from 100, we end up 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 17236.266, with a leftover of 0.001.