Finding the Fourth Proportional to 12,185.50, 16,807.10 and 9,320.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,185.50 : 16,807.10 = 9,320.72 : x
2. Step 2: Convert to fraction form
   12,185.50/16,807.10 = 9,320.72/x
3. Step 3: Cross multiply
   12,185.50x = 16,807.10 × 9,320.72
4. Step 4: Simplify right side
   12,185.50x = 156,654,273.11
5. Step 5: Solve for x
   x = 156,654,273.11/12,185.50
6. Step 6: Final answer
   x = 12,855.79