Step 1:
The first step to converting 546.6392398817 to a fraction is to re-write 546.6392398817 in the form p/q where p and q are both positive integers. To start with, 546.6392398817 can be written as simply 546.6392398817/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 546.6392398817, which in this case is 10. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 546.6392398817/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 546.6392398817/1 each by 10000000000:
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 546.6392398817 as a fraction:
19679/36 / 1