Finding the Fourth Proportional to 9,887.20, 14,772.72 and 9,542.64

Step by Step Solution

1. Step 1: Write the proportion equation
   9,887.20 : 14,772.72 = 9,542.64 : x
2. Step 2: Convert to fraction form
   9,887.20/14,772.72 = 9,542.64/x
3. Step 3: Cross multiply
   9,887.20x = 14,772.72 × 9,542.64
4. Step 4: Simplify right side
   9,887.20x = 140,970,748.78
5. Step 5: Solve for x
   x = 140,970,748.78/9,887.20
6. Step 6: Final answer
   x = 14,257.90