Finding the Fourth Proportional to 12,339.47, 18,517.40 and 5,766.15

Step by Step Solution

1. Step 1: Write the proportion equation
   12,339.47 : 18,517.40 = 5,766.15 : x
2. Step 2: Convert to fraction form
   12,339.47/18,517.40 = 5,766.15/x
3. Step 3: Cross multiply
   12,339.47x = 18,517.40 × 5,766.15
4. Step 4: Simplify right side
   12,339.47x = 106,774,077.18
5. Step 5: Solve for x
   x = 106,774,077.18/12,339.47
6. Step 6: Final answer
   x = 8,653.06