Finding the Fourth Proportional to 9,358.81, 12,915.15 and 5,380.69

Step by Step Solution

1. Step 1: Write the proportion equation
   9,358.81 : 12,915.15 = 5,380.69 : x
2. Step 2: Convert to fraction form
   9,358.81/12,915.15 = 5,380.69/x
3. Step 3: Cross multiply
   9,358.81x = 12,915.15 × 5,380.69
4. Step 4: Simplify right side
   9,358.81x = 69,492,418.45
5. Step 5: Solve for x
   x = 69,492,418.45/9,358.81
6. Step 6: Final answer
   x = 7,425.35