Finding the Fourth Proportional to 12,559.97, 17,335.15 and 8,311.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,559.97 : 17,335.15 = 8,311.12 : x
2. Step 2: Convert to fraction form
   12,559.97/17,335.15 = 8,311.12/x
3. Step 3: Cross multiply
   12,559.97x = 17,335.15 × 8,311.12
4. Step 4: Simplify right side
   12,559.97x = 144,074,511.87
5. Step 5: Solve for x
   x = 144,074,511.87/12,559.97
6. Step 6: Final answer
   x = 11,470.93