Step 1:
The first step to converting 4858.9878363 to a fraction is to re-write 4858.9878363 in the form p/q where p and q are both positive integers. To start with, 4858.9878363 can be written as simply 4858.9878363/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 4858.9878363, which in this case is 7. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 4858.9878363/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 4858.9878363/1 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 4858.9878363 as a fraction:
398437/82 / 1