Finding the Fourth Proportional to 12,666.15, 17,458.32 and 9,516.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,666.15 : 17,458.32 = 9,516.87 : x
2. Step 2: Convert to fraction form
   12,666.15/17,458.32 = 9,516.87/x
3. Step 3: Cross multiply
   12,666.15x = 17,458.32 × 9,516.87
4. Step 4: Simplify right side
   12,666.15x = 166,148,561.86
5. Step 5: Solve for x
   x = 166,148,561.86/12,666.15
6. Step 6: Final answer
   x = 13,117.53