Step 1:
The first step to converting 509780.188379 to a fraction is to re-write 509780.188379 in the form p/q where p and q are both positive integers. To start with, 509780.188379 can be written as simply 509780.188379/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 509780.188379, which in this case is 6. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 509780.188379/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 509780.188379/1 each by 1000000:
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 509780.188379 as a fraction:
509780/1 / 1