Finding the Fourth Proportional to 9,288.28, 12,818.72 and 5,308.64

Step by Step Solution

1. Step 1: Write the proportion equation
   9,288.28 : 12,818.72 = 5,308.64 : x
2. Step 2: Convert to fraction form
   9,288.28/12,818.72 = 5,308.64/x
3. Step 3: Cross multiply
   9,288.28x = 12,818.72 × 5,308.64
4. Step 4: Simplify right side
   9,288.28x = 68,049,969.74
5. Step 5: Solve for x
   x = 68,049,969.74/9,288.28
6. Step 6: Final answer
   x = 7,326.43