Step 1:
The first step to converting 519.78012168909 to a fraction is to re-write 519.78012168909 in the form p/q where p and q are both positive integers. To start with, 519.78012168909 can be written as simply 519.78012168909/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 519.78012168909, which in this case is 11. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 519.78012168909/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 519.78012168909/1 each by 100000000000:
Step 3:
Now the last step is to simplify the fraction (if possible) by finding similar factors and cancelling them out, which leads to the following answer for 519.78012168909 as a fraction:
21311/41 / 1