Finding the Fourth Proportional to 9,321.92, 12,863.92 and 5,130.16

Step by Step Solution

1. Step 1: Write the proportion equation
   9,321.92 : 12,863.92 = 5,130.16 : x
2. Step 2: Convert to fraction form
   9,321.92/12,863.92 = 5,130.16/x
3. Step 3: Cross multiply
   9,321.92x = 12,863.92 × 5,130.16
4. Step 4: Simplify right side
   9,321.92x = 65,993,967.83
5. Step 5: Solve for x
   x = 65,993,967.83/9,321.92
6. Step 6: Final answer
   x = 7,079.44