Finding the Fourth Proportional to 86,566.72, 129,850.24 and 20,902.72

Step by Step Solution

1. Step 1: Write the proportion equation
   86,566.72 : 129,850.24 = 20,902.72 : x
2. Step 2: Convert to fraction form
   86,566.72/129,850.24 = 20,902.72/x
3. Step 3: Cross multiply
   86,566.72x = 129,850.24 × 20,902.72
4. Step 4: Simplify right side
   86,566.72x = 2,714,223,208.65
5. Step 5: Solve for x
   x = 2,714,223,208.65/86,566.72
6. Step 6: Final answer
   x = 31,354.12