Finding the Fourth Proportional to 5,174.49, 7,143.71 and 3,960.89

Step by Step Solution

1. Step 1: Write the proportion equation
   5,174.49 : 7,143.71 = 3,960.89 : x
2. Step 2: Convert to fraction form
   5,174.49/7,143.71 = 3,960.89/x
3. Step 3: Cross multiply
   5,174.49x = 7,143.71 × 3,960.89
4. Step 4: Simplify right side
   5,174.49x = 28,295,393.98
5. Step 5: Solve for x
   x = 28,295,393.98/5,174.49
6. Step 6: Final answer
   x = 5,468.25