509919 divided by 86 
Let's see how many times 86 fits into 509919.

Step 1:
86 goes into 5 0 times with a remainder of 5.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 5, we get 5.
Take the next digit (0) from the dividend and append it to 5, then repeat: 50 / 86

Going ahead to step 2:
86 goes into 50 0 times with a remainder of 50.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we take 0 away from 50, we end up with 50.
Include the next digit (9) from the dividend after 50, then repeat: 509 / 86

Moving on to step 3:
86 can be fit into 509 5 times, resulting in a remainder of 79.
The next digit of our result is 5. 
Result so far: 5.0
If we subtract 430 from 509, we get 79.
Fetch the next digit (9) from the dividend, attach it to 79 and continue: 799 / 86

Moving on to step 4:
When dividing 799 by 86, we get 9 with a remainder of 25.
The number 9 becomes the next digit in our result. 
Result so far: 59.0
Subtract 774 from 799 to get 25.
Grab the next digit (1) from the dividend, add it to 25, then carry on: 251 / 86

On to step 5:
If we divide 251 by 86, we get 2 and a remainder of 79.
Use 2 as the next digit of our solution. 
Result so far: 592.0
If we subtract 172 from 251, we get 79.
Grab the next digit (9) from the dividend, add it to 79, then carry on: 799 / 86

On to step 6:
If we divide 799 by 86, we get 9 and a remainder of 25.
Record the quotient 9 as the next digit in the result. 
Result so far: 5929.0
Deduct 774 from 799 and we're left with 25.
Since there are no more digits in the dividend, we add a zero to the remainder making it 250, and continue the process.

Let's proceed to step 7:
250 divided by 86 is 2 with a remainder of 78.
The next digit of our result is 2. 
Result so far: 5929.2
If we take 172 away from 250, we end up with 78.
Since there are no more digits in the dividend, we add a zero to the remainder making it 780, and continue the process.

Let's proceed to step 8:
When dividing 780 by 86, we get 9 with a remainder of 6.
Write down 9 as next digit of the result. 
Result so far: 5929.29
Deduct 774 from 780 and we're left with 6.
Since there are no more digits in the dividend, we add a zero to the remainder making it 60, and continue the process.

Advancing to step 9:
86 goes into 60 0 times with a remainder of 60.
The next digit of our result is 0. 
Result so far: 5929.29
Deduct 0 from 60 and we're left with 60.
Since there are no more digits in the dividend, we add a zero to the remainder making it 600, and continue the process.

Let's proceed to step 10:
When dividing 600 by 86, we get 6 with a remainder of 84.
The number 6 becomes the next digit in our result. 
Result so far: 5929.2906
Deduct 516 from 600 and we're left with 84.
Since there are no more digits in the dividend, we add a zero to the remainder making it 840, and continue the process.

Step 11:
86 can be fit into 840 9 times, resulting in a remainder of 66.
Use 9 as the next digit of our solution. 
Result so far: 5929.29069
If we subtract 774 from 840, we get 66.
Since there are no more digits in the dividend, we add a zero to the remainder making it 660, and continue the process.

Let's proceed to step 12:
The number 86 fits into 660 7 times, leaving a remainder of 58.
Write down 7 as next digit of the result. 
Result so far: 5929.290697
Subtract 602 from 660 to get 58.
Since there are no more digits in the dividend, we add a zero to the remainder making it 580, and continue the process.

Going ahead to step 13:
86 goes into 580 6 times with a remainder of 64.
Write down 6 as next digit of the result. 
Result so far: 5929.2906976
Subtract 516 from 580 to get 64.
Since there are no more digits in the dividend, we add a zero to the remainder making it 640, and continue the process.

Going ahead to step 14:
If we divide 640 by 86, we get 7 and a remainder of 38.
The next digit of our result is 7. 
Result so far: 5929.29069767
Subtracting 602 from 640 leaves us with 38.
Since there are no more digits in the dividend, we add a zero to the remainder making it 380, and continue the process.

The final outcome is 5929.29069767, with a leftover of 3.8e-08.