212459 divided by 17 
We're looking to find how many times 17 goes into 212459.

Going ahead to step 1:
17 goes into 2 0 times with a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we take 0 away from 2, we end up with 2.
Fetch the next digit (1) from the dividend, attach it to 2 and continue: 21 / 17

Moving on to step 2:
When dividing 21 by 17, we get 1 with a remainder of 4.
Put 1 as the next digit of the answer. 
Result so far: 1.0
If we subtract 17 from 21, we get 4.
Append the next digit (2) from the dividend to 4 and continue with: 42 / 17

On to step 3:
The number 17 fits into 42 2 times, leaving a remainder of 8.
The number 2 becomes the next digit in our result. 
Result so far: 12.0
Deduct 34 from 42 and we're left with 8.
Take the next digit (4) from the dividend and append it to 8, then repeat: 84 / 17

Let's proceed to step 4:
17 can be fit into 84 4 times, resulting in a remainder of 16.
Write down 4 as next digit of the result. 
Result so far: 124.0
The remainder is 16 after subtracting 68 from 84.
Append the next digit (5) from the dividend to 16 and continue with: 165 / 17

Step 5:
17 can be fit into 165 9 times, resulting in a remainder of 12.
Use 9 as the next digit of our solution. 
Result so far: 1249.0
Subtracting 153 from 165 leaves us with 12.
Take the next digit (9) from the dividend and append it to 12, then repeat: 129 / 17

Step 6:
If we divide 129 by 17, we get 7 and a remainder of 10.
Record the quotient 7 as the next digit in the result. 
Result so far: 12497.0
If we subtract 119 from 129, we get 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 7:
The number 17 fits into 100 5 times, leaving a remainder of 15.
The number 5 becomes the next digit in our result. 
Result so far: 12497.5
Subtract 85 from 100 to get 15.
Since there are no more digits in the dividend, we add a zero to the remainder making it 150, and continue the process.

Going ahead to step 8:
If we divide 150 by 17, we get 8 and a remainder of 14.
The next digit of our result is 8. 
Result so far: 12497.58
Subtract 136 from 150 to get 14.
Since there are no more digits in the dividend, we add a zero to the remainder making it 140, and continue the process.

Let's proceed to step 9:
The number 17 fits into 140 8 times, leaving a remainder of 4.
Write down 8 as next digit of the result. 
Result so far: 12497.588
If we take 136 away from 140, 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.

The final result is 12497.588 with a remainder of 0.0004.