Finding the Fourth Proportional to 12,439.50, 17,168.67 and 7,134.54

Step by Step Solution

1. Step 1: Write the proportion equation
   12,439.50 : 17,168.67 = 7,134.54 : x
2. Step 2: Convert to fraction form
   12,439.50/17,168.67 = 7,134.54/x
3. Step 3: Cross multiply
   12,439.50x = 17,168.67 × 7,134.54
4. Step 4: Simplify right side
   12,439.50x = 122,490,562.86
5. Step 5: Solve for x
   x = 122,490,562.86/12,439.50
6. Step 6: Final answer
   x = 9,846.90