Finding the Fourth Proportional to 12,658.38, 17,445.15 and 9,859.02

Step by Step Solution

1. Step 1: Write the proportion equation
   12,658.38 : 17,445.15 = 9,859.02 : x
2. Step 2: Convert to fraction form
   12,658.38/17,445.15 = 9,859.02/x
3. Step 3: Cross multiply
   12,658.38x = 17,445.15 × 9,859.02
4. Step 4: Simplify right side
   12,658.38x = 171,992,082.75
5. Step 5: Solve for x
   x = 171,992,082.75/12,658.38
6. Step 6: Final answer
   x = 13,587.21