Finding the Fourth Proportional to 9,288.78, 12,818.57 and 5,310.87

Step by Step Solution

1. Step 1: Write the proportion equation
   9,288.78 : 12,818.57 = 5,310.87 : x
2. Step 2: Convert to fraction form
   9,288.78/12,818.57 = 5,310.87/x
3. Step 3: Cross multiply
   9,288.78x = 12,818.57 × 5,310.87
4. Step 4: Simplify right side
   9,288.78x = 68,077,732.30
5. Step 5: Solve for x
   x = 68,077,732.30/9,288.78
6. Step 6: Final answer
   x = 7,329.03