Finding the Fourth Proportional to 8,329.50, 12,483.72 and 7,287.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,329.50 : 12,483.72 = 7,287.12 : x
2. Step 2: Convert to fraction form
   8,329.50/12,483.72 = 7,287.12/x
3. Step 3: Cross multiply
   8,329.50x = 12,483.72 × 7,287.12
4. Step 4: Simplify right side
   8,329.50x = 90,970,365.69
5. Step 5: Solve for x
   x = 90,970,365.69/8,329.50
6. Step 6: Final answer
   x = 10,921.47