Finding the Fourth Proportional to 9,359.76, 12,915.60 and 5,380.62

Step by Step Solution

1. Step 1: Write the proportion equation
   9,359.76 : 12,915.60 = 5,380.62 : x
2. Step 2: Convert to fraction form
   9,359.76/12,915.60 = 5,380.62/x
3. Step 3: Cross multiply
   9,359.76x = 12,915.60 × 5,380.62
4. Step 4: Simplify right side
   9,359.76x = 69,493,935.67
5. Step 5: Solve for x
   x = 69,493,935.67/9,359.76
6. Step 6: Final answer
   x = 7,424.76