Finding the Fourth Proportional to 12,238.72, 18,339.39 and 9,103.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,238.72 : 18,339.39 = 9,103.56 : x
2. Step 2: Convert to fraction form
   12,238.72/18,339.39 = 9,103.56/x
3. Step 3: Cross multiply
   12,238.72x = 18,339.39 × 9,103.56
4. Step 4: Simplify right side
   12,238.72x = 166,953,691.71
5. Step 5: Solve for x
   x = 166,953,691.71/12,238.72
6. Step 6: Final answer
   x = 13,641.44