Finding the Fourth Proportional to 9,280.78, 12,807.50 and 5,505.82

Step by Step Solution

1. Step 1: Write the proportion equation
   9,280.78 : 12,807.50 = 5,505.82 : x
2. Step 2: Convert to fraction form
   9,280.78/12,807.50 = 5,505.82/x
3. Step 3: Cross multiply
   9,280.78x = 12,807.50 × 5,505.82
4. Step 4: Simplify right side
   9,280.78x = 70,515,730.10
5. Step 5: Solve for x
   x = 70,515,730.10/9,280.78
6. Step 6: Final answer
   x = 7,598.04