Finding the Fourth Proportional to 12,658.91, 17,444.63 and 9,115.43

Step by Step Solution

1. Step 1: Write the proportion equation
   12,658.91 : 17,444.63 = 9,115.43 : x
2. Step 2: Convert to fraction form
   12,658.91/17,444.63 = 9,115.43/x
3. Step 3: Cross multiply
   12,658.91x = 17,444.63 × 9,115.43
4. Step 4: Simplify right side
   12,658.91x = 159,015,253.35
5. Step 5: Solve for x
   x = 159,015,253.35/12,658.91
6. Step 6: Final answer
   x = 12,561.53