Finding the Fourth Proportional to 9,142.52, 12,617.33 and 5,558.90

Step by Step Solution

1. Step 1: Write the proportion equation
   9,142.52 : 12,617.33 = 5,558.90 : x
2. Step 2: Convert to fraction form
   9,142.52/12,617.33 = 5,558.90/x
3. Step 3: Cross multiply
   9,142.52x = 12,617.33 × 5,558.90
4. Step 4: Simplify right side
   9,142.52x = 70,138,384.86
5. Step 5: Solve for x
   x = 70,138,384.86/9,142.52
6. Step 6: Final answer
   x = 7,671.67