Finding the Fourth Proportional to 9,321.25, 12,863.33 and 5,129.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,321.25 : 12,863.33 = 5,129.50 : x
2. Step 2: Convert to fraction form
   9,321.25/12,863.33 = 5,129.50/x
3. Step 3: Cross multiply
   9,321.25x = 12,863.33 × 5,129.50
4. Step 4: Simplify right side
   9,321.25x = 65,982,451.24
5. Step 5: Solve for x
   x = 65,982,451.24/9,321.25
6. Step 6: Final answer
   x = 7,078.71