Finding the Fourth Proportional to 12,429.30, 17,158.79 and 9,590.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,429.30 : 17,158.79 = 9,590.30 : x
2. Step 2: Convert to fraction form
   12,429.30/17,158.79 = 9,590.30/x
3. Step 3: Cross multiply
   12,429.30x = 17,158.79 × 9,590.30
4. Step 4: Simplify right side
   12,429.30x = 164,557,892.32
5. Step 5: Solve for x
   x = 164,557,892.32/12,429.30
6. Step 6: Final answer
   x = 13,239.52