Finding the Fourth Proportional to 12,238.31, 18,354.49 and 5,658.21

Step by Step Solution

1. Step 1: Write the proportion equation
   12,238.31 : 18,354.49 = 5,658.21 : x
2. Step 2: Convert to fraction form
   12,238.31/18,354.49 = 5,658.21/x
3. Step 3: Cross multiply
   12,238.31x = 18,354.49 × 5,658.21
4. Step 4: Simplify right side
   12,238.31x = 103,853,558.86
5. Step 5: Solve for x
   x = 103,853,558.86/12,238.31
6. Step 6: Final answer
   x = 8,485.94