Finding the Fourth Proportional to 20,686.64, 30,978.12 and 16,327.76

Step by Step Solution

1. Step 1: Write the proportion equation
   20,686.64 : 30,978.12 = 16,327.76 : x
2. Step 2: Convert to fraction form
   20,686.64/30,978.12 = 16,327.76/x
3. Step 3: Cross multiply
   20,686.64x = 30,978.12 × 16,327.76
4. Step 4: Simplify right side
   20,686.64x = 505,803,308.61
5. Step 5: Solve for x
   x = 505,803,308.61/20,686.64
6. Step 6: Final answer
   x = 24,450.72