Finding the Fourth Proportional to 7,231.05, 9,978.71 and 4,087.17

Step by Step Solution

1. Step 1: Write the proportion equation
   7,231.05 : 9,978.71 = 4,087.17 : x
2. Step 2: Convert to fraction form
   7,231.05/9,978.71 = 4,087.17/x
3. Step 3: Cross multiply
   7,231.05x = 9,978.71 × 4,087.17
4. Step 4: Simplify right side
   7,231.05x = 40,784,684.15
5. Step 5: Solve for x
   x = 40,784,684.15/7,231.05
6. Step 6: Final answer
   x = 5,640.22