Finding the Fourth Proportional to 12,469.55, 17,209.87 and 7,165.16

Step by Step Solution

1. Step 1: Write the proportion equation
   12,469.55 : 17,209.87 = 7,165.16 : x
2. Step 2: Convert to fraction form
   12,469.55/17,209.87 = 7,165.16/x
3. Step 3: Cross multiply
   12,469.55x = 17,209.87 × 7,165.16
4. Step 4: Simplify right side
   12,469.55x = 123,311,432.70
5. Step 5: Solve for x
   x = 123,311,432.70/12,469.55
6. Step 6: Final answer
   x = 9,889.01