Finding the Fourth Proportional to 9,359.55, 12,915.86 and 5,380.61

Step by Step Solution

1. Step 1: Write the proportion equation
   9,359.55 : 12,915.86 = 5,380.61 : x
2. Step 2: Convert to fraction form
   9,359.55/12,915.86 = 5,380.61/x
3. Step 3: Cross multiply
   9,359.55x = 12,915.86 × 5,380.61
4. Step 4: Simplify right side
   9,359.55x = 69,495,113.99
5. Step 5: Solve for x
   x = 69,495,113.99/9,359.55
6. Step 6: Final answer
   x = 7,425.05