Finding the Fourth Proportional to 9,358.56, 12,915.12 and 5,380.32

Step by Step Solution

1. Step 1: Write the proportion equation
   9,358.56 : 12,915.12 = 5,380.32 : x
2. Step 2: Convert to fraction form
   9,358.56/12,915.12 = 5,380.32/x
3. Step 3: Cross multiply
   9,358.56x = 12,915.12 × 5,380.32
4. Step 4: Simplify right side
   9,358.56x = 69,487,478.44
5. Step 5: Solve for x
   x = 69,487,478.44/9,358.56
6. Step 6: Final answer
   x = 7,425.02