Finding the Fourth Proportional to 28,662.72, 39,560.16 and 16,086.72

Step by Step Solution

1. Step 1: Write the proportion equation
   28,662.72 : 39,560.16 = 16,086.72 : x
2. Step 2: Convert to fraction form
   28,662.72/39,560.16 = 16,086.72/x
3. Step 3: Cross multiply
   28,662.72x = 39,560.16 × 16,086.72
4. Step 4: Simplify right side
   28,662.72x = 636,393,217.08
5. Step 5: Solve for x
   x = 636,393,217.08/28,662.72
6. Step 6: Final answer
   x = 22,202.82