Step 1:
The first step to converting 778172.8207009 to a fraction is to re-write 778172.8207009 in the form p/q where p and q are both positive integers. To start with, 778172.8207009 can be written as simply 778172.8207009/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 778172.8207009, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 778172.8207009/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 778172.8207009/1 each by 10000000:
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 778172.8207009 as a fraction:
778173/1 / 1