Finding the Fourth Proportional to 12,520.86, 17,280.72 and 7,143.32

Step by Step Solution

1. Step 1: Write the proportion equation
   12,520.86 : 17,280.72 = 7,143.32 : x
2. Step 2: Convert to fraction form
   12,520.86/17,280.72 = 7,143.32/x
3. Step 3: Cross multiply
   12,520.86x = 17,280.72 × 7,143.32
4. Step 4: Simplify right side
   12,520.86x = 123,441,712.79
5. Step 5: Solve for x
   x = 123,441,712.79/12,520.86
6. Step 6: Final answer
   x = 9,858.88