Finding the Fourth Proportional to 9,216.45, 12,717.09 and 5,439.33

Step by Step Solution

1. Step 1: Write the proportion equation
   9,216.45 : 12,717.09 = 5,439.33 : x
2. Step 2: Convert to fraction form
   9,216.45/12,717.09 = 5,439.33/x
3. Step 3: Cross multiply
   9,216.45x = 12,717.09 × 5,439.33
4. Step 4: Simplify right side
   9,216.45x = 69,172,449.15
5. Step 5: Solve for x
   x = 69,172,449.15/9,216.45
6. Step 6: Final answer
   x = 7,505.32