Finding the Fourth Proportional to 12,815.30, 17,658.87 and 9,452.79

Step by Step Solution

1. Step 1: Write the proportion equation
   12,815.30 : 17,658.87 = 9,452.79 : x
2. Step 2: Convert to fraction form
   12,815.30/17,658.87 = 9,452.79/x
3. Step 3: Cross multiply
   12,815.30x = 17,658.87 × 9,452.79
4. Step 4: Simplify right side
   12,815.30x = 166,925,589.75
5. Step 5: Solve for x
   x = 166,925,589.75/12,815.30
6. Step 6: Final answer
   x = 13,025.49