Finding the Fourth Proportional to 9,915.98, 13,684.43 and 5,439.92

Step by Step Solution

1. Step 1: Write the proportion equation
   9,915.98 : 13,684.43 = 5,439.92 : x
2. Step 2: Convert to fraction form
   9,915.98/13,684.43 = 5,439.92/x
3. Step 3: Cross multiply
   9,915.98x = 13,684.43 × 5,439.92
4. Step 4: Simplify right side
   9,915.98x = 74,442,204.45
5. Step 5: Solve for x
   x = 74,442,204.45/9,915.98
6. Step 6: Final answer
   x = 7,507.30