Finding the Fourth Proportional to 9,359.69, 13,978.85 and 8,480.43

Step by Step Solution

1. Step 1: Write the proportion equation
   9,359.69 : 13,978.85 = 8,480.43 : x
2. Step 2: Convert to fraction form
   9,359.69/13,978.85 = 8,480.43/x
3. Step 3: Cross multiply
   9,359.69x = 13,978.85 × 8,480.43
4. Step 4: Simplify right side
   9,359.69x = 118,546,616.50
5. Step 5: Solve for x
   x = 118,546,616.50/9,359.69
6. Step 6: Final answer
   x = 12,665.66