Step 1:
The first step to converting 1861719638.6356 to a fraction is to re-write 1861719638.6356 in the form p/q where p and q are both positive integers. To start with, 1861719638.6356 can be written as simply 1861719638.6356/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 1861719638.6356, which in this case is 4. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 1861719638.6356/1 each by 10 to the power of that many digits. So, in this case, we will multiply the numerator and denominator of 1861719638.6356/1 each by 10000:
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 1861719638.6356 as a fraction:
1861719638/1 / 1