Finding the Fourth Proportional to 81,799.56, 122,713.56 and 31,906.80

Step by Step Solution

1. Step 1: Write the proportion equation
   81,799.56 : 122,713.56 = 31,906.80 : x
2. Step 2: Convert to fraction form
   81,799.56/122,713.56 = 31,906.80/x
3. Step 3: Cross multiply
   81,799.56x = 122,713.56 × 31,906.80
4. Step 4: Simplify right side
   81,799.56x = 3,915,397,016.21
5. Step 5: Solve for x
   x = 3,915,397,016.21/81,799.56
6. Step 6: Final answer
   x = 47,865.75