Finding the Fourth Proportional to 31,680.88, 47,498.16 and 20,598.64

Step by Step Solution

1. Step 1: Write the proportion equation
   31,680.88 : 47,498.16 = 20,598.64 : x
2. Step 2: Convert to fraction form
   31,680.88/47,498.16 = 20,598.64/x
3. Step 3: Cross multiply
   31,680.88x = 47,498.16 × 20,598.64
4. Step 4: Simplify right side
   31,680.88x = 978,397,498.50
5. Step 5: Solve for x
   x = 978,397,498.50/31,680.88
6. Step 6: Final answer
   x = 30,882.90