Finding the Fourth Proportional to 16,972.72, 23,421.72 and 9,520.24

Step by Step Solution

1. Step 1: Write the proportion equation
   16,972.72 : 23,421.72 = 9,520.24 : x
2. Step 2: Convert to fraction form
   16,972.72/23,421.72 = 9,520.24/x
3. Step 3: Cross multiply
   16,972.72x = 23,421.72 × 9,520.24
4. Step 4: Simplify right side
   16,972.72x = 222,980,395.61
5. Step 5: Solve for x
   x = 222,980,395.61/16,972.72
6. Step 6: Final answer
   x = 13,137.58