Step 1:
The first step to converting 21304.878 to a fraction is to re-write 21304.878 in the form p/q where p and q are both positive integers. To start with, 21304.878 can be written as simply 21304.878/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 21304.878, which in this case is 3. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 21304.878/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 21304.878/1 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 21304.878 as a fraction:
170439/8 / 1