Finding the Fourth Proportional to 7,081.61, 9,775.28 and 5,318.31

Step by Step Solution

1. Step 1: Write the proportion equation
   7,081.61 : 9,775.28 = 5,318.31 : x
2. Step 2: Convert to fraction form
   7,081.61/9,775.28 = 5,318.31/x
3. Step 3: Cross multiply
   7,081.61x = 9,775.28 × 5,318.31
4. Step 4: Simplify right side
   7,081.61x = 51,987,942.79
5. Step 5: Solve for x
   x = 51,987,942.79/7,081.61
6. Step 6: Final answer
   x = 7,341.27