Step 1:
The first step to converting 508420.785 to a fraction is to re-write 508420.785 in the form p/q where p and q are both positive integers. To start with, 508420.785 can be written as simply 508420.785/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 508420.785, which in this case is 3. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 508420.785/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 508420.785/1 each by 1000:
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 508420.785 as a fraction:
508421/1 / 1