Finding the Fourth Proportional to 8,943.78, 12,339.92 and 5,589.99

Step by Step Solution

1. Step 1: Write the proportion equation
   8,943.78 : 12,339.92 = 5,589.99 : x
2. Step 2: Convert to fraction form
   8,943.78/12,339.92 = 5,589.99/x
3. Step 3: Cross multiply
   8,943.78x = 12,339.92 × 5,589.99
4. Step 4: Simplify right side
   8,943.78x = 68,980,001.45
5. Step 5: Solve for x
   x = 68,980,001.45/8,943.78
6. Step 6: Final answer
   x = 7,712.62