Finding the Fourth Proportional to 9,358.88, 12,915.28 and 5,379.72

Step by Step Solution

1. Step 1: Write the proportion equation
   9,358.88 : 12,915.28 = 5,379.72 : x
2. Step 2: Convert to fraction form
   9,358.88/12,915.28 = 5,379.72/x
3. Step 3: Cross multiply
   9,358.88x = 12,915.28 × 5,379.72
4. Step 4: Simplify right side
   9,358.88x = 69,480,590.12
5. Step 5: Solve for x
   x = 69,480,590.12/9,358.88
6. Step 6: Final answer
   x = 7,424.03