Finding the Fourth Proportional to 12,238.94, 18,339.71 and 9,103.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,238.94 : 18,339.71 = 9,103.78 : x
2. Step 2: Convert to fraction form
   12,238.94/18,339.71 = 9,103.78/x
3. Step 3: Cross multiply
   12,238.94x = 18,339.71 × 9,103.78
4. Step 4: Simplify right side
   12,238.94x = 166,960,685.10
5. Step 5: Solve for x
   x = 166,960,685.10/12,238.94
6. Step 6: Final answer
   x = 13,641.76