Finding the Fourth Proportional to 12,904.38, 17,807.42 and 7,238.42

Step by Step Solution

1. Step 1: Write the proportion equation
   12,904.38 : 17,807.42 = 7,238.42 : x
2. Step 2: Convert to fraction form
   12,904.38/17,807.42 = 7,238.42/x
3. Step 3: Cross multiply
   12,904.38x = 17,807.42 × 7,238.42
4. Step 4: Simplify right side
   12,904.38x = 128,897,585.08
5. Step 5: Solve for x
   x = 128,897,585.08/12,904.38
6. Step 6: Final answer
   x = 9,988.67