We look at the division of 71239763 by 210 
Our goal is to divide 71239763 by 210.

Step 1:
The number 210 fits into 7 0 times, leaving a remainder of 7.
The next digit of our result is 0. 
Result so far: 0.0
If we subtract 0 from 7, we get 7.
Append the next digit (1) from the dividend to 7 and continue with: 71 / 210

Going ahead to step 2:
210 can be fit into 71 0 times, resulting in a remainder of 71.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
Deduct 0 from 71 and we're left with 71.
Include the next digit (2) from the dividend after 71, then repeat: 712 / 210

Going ahead to step 3:
The number 210 fits into 712 3 times, leaving a remainder of 82.
Use 3 as the next digit of our solution. 
Result so far: 3.0
Deduct 630 from 712 and we're left with 82.
Include the next digit (3) from the dividend after 82, then repeat: 823 / 210

Moving on to step 4:
When dividing 823 by 210, we get 3 with a remainder of 193.
Put 3 as the next digit of the answer. 
Result so far: 33.0
If we take 630 away from 823, we end up with 193.
Fetch the next digit (9) from the dividend, attach it to 193 and continue: 1939 / 210

Step 5:
If we divide 1939 by 210, we get 9 and a remainder of 49.
Put 9 as the next digit of the answer. 
Result so far: 339.0
Deduct 1890 from 1939 and we're left with 49.
Include the next digit (7) from the dividend after 49, then repeat: 497 / 210

Moving on to step 6:
When dividing 497 by 210, we get 2 with a remainder of 77.
The next digit of our result is 2. 
Result so far: 3392.0
Deduct 420 from 497 and we're left with 77.
Grab the next digit (6) from the dividend, add it to 77, then carry on: 776 / 210

On to step 7:
210 can be fit into 776 3 times, resulting in a remainder of 146.
The number 3 becomes the next digit in our result. 
Result so far: 33923.0
Deduct 630 from 776 and we're left with 146.
Bring next digit (3) of the dividend behind the 146 and repeat the process: 1463 / 210

Advancing to step 8:
1463 divided by 210 is 6 with a remainder of 203.
The next digit of our result is 6. 
Result so far: 339236.0
Deduct 1260 from 1463 and we're left with 203.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2030, and continue the process.

Step 9:
210 can be fit into 2030 9 times, resulting in a remainder of 140.
The next digit of our result is 9. 
Result so far: 339236.9
If we subtract 1890 from 2030, we get 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Advancing to step 10:
1400 divided by 210 is 6 with a remainder of 140.
Put 6 as the next digit of the answer. 
Result so far: 339236.96
If we take 1260 away from 1400, we end up with 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

Step 11:
If we divide 1400 by 210, we get 6 and a remainder of 140.
Use 6 as the next digit of our solution. 
Result so far: 339236.966
Subtract 1260 from 1400 to get 140.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1400, and continue the process.

The final outcome is 339236.966, with a leftover of 0.014.