209319 ÷ 51 
Our goal is to divide 209319 by 51.

Going ahead to step 1:
51 can be fit into 2 0 times, resulting in a remainder of 2.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
The remainder is 2 after subtracting 0 from 2.
Take the next digit (0) from the dividend and append it to 2, then repeat: 20 / 51

Advancing to step 2:
If we divide 20 by 51, we get 0 and a remainder of 20.
Write down 0 as next digit of the result. 
Result so far: 0.0
Subtracting 0 from 20 leaves us with 20.
Append the next digit (9) from the dividend to 20 and continue with: 209 / 51

Let's proceed to step 3:
When dividing 209 by 51, we get 4 with a remainder of 5.
Write down 4 as next digit of the result. 
Result so far: 4.0
If we take 204 away from 209, we end up with 5.
Append the next digit (3) from the dividend to 5 and continue with: 53 / 51

Let's proceed to step 4:
When dividing 53 by 51, we get 1 with a remainder of 2.
The number 1 becomes the next digit in our result. 
Result so far: 41.0
Deduct 51 from 53 and we're left with 2.
Take the next digit (1) from the dividend and append it to 2, then repeat: 21 / 51

Moving on to step 5:
If we divide 21 by 51, we get 0 and a remainder of 21.
The next digit of our result is 0. 
Result so far: 410.0
If we take 0 away from 21, we end up with 21.
Bring next digit (9) of the dividend behind the 21 and repeat the process: 219 / 51

Advancing to step 6:
When dividing 219 by 51, we get 4 with a remainder of 15.
Write down 4 as next digit of the result. 
Result so far: 4104.0
If we subtract 204 from 219, we 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 7:
51 can be fit into 150 2 times, resulting in a remainder of 48.
Put 2 as the next digit of the answer. 
Result so far: 4104.2
The remainder is 48 after subtracting 102 from 150.
Since there are no more digits in the dividend, we add a zero to the remainder making it 480, and continue the process.

Let's proceed to step 8:
If we divide 480 by 51, we get 9 and a remainder of 21.
Put 9 as the next digit of the answer. 
Result so far: 4104.29
If we take 459 away from 480, we end up with 21.
Since there are no more digits in the dividend, we add a zero to the remainder making it 210, and continue the process.

Advancing to step 9:
210 divided by 51 is 4 with a remainder of 6.
Record the quotient 4 as the next digit in the result. 
Result so far: 4104.294
The remainder is 6 after subtracting 204 from 210.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Let's proceed to step 10:
51 goes into 60 1 times with a remainder of 9.
Use 1 as the next digit of our solution. 
Result so far: 4104.2941
If we subtract 51 from 60, we get 9.
Since there are no more digits in the dividend, we add a zero to the remainder making it 90, and continue the process.

Step 11:
The number 51 fits into 90 1 times, leaving a remainder of 39.
Put 1 as the next digit of the answer. 
Result so far: 4104.29411
The remainder is 39 after subtracting 51 from 90.
Since there are no more digits in the dividend, we add a zero to the remainder making it 390, and continue the process.

After the division, we end up with 4104.29411 and a remainder of 3.9e-05.