Step 1:
The first step to converting 68078761879.451 to a fraction is to re-write 68078761879.451 in the form p/q where p and q are both positive integers. To start with, 68078761879.451 can be written as simply 68078761879.451/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 68078761879.451, which in this case is 3. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 68078761879.451/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 68078761879.451/1 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 68078761879.451 as a fraction:
68078761879/1 / 1