Finding the Fourth Proportional to 7,143.98, 9,859.04 and 4,311.31

Step by Step Solution

1. Step 1: Write the proportion equation
   7,143.98 : 9,859.04 = 4,311.31 : x
2. Step 2: Convert to fraction form
   7,143.98/9,859.04 = 4,311.31/x
3. Step 3: Cross multiply
   7,143.98x = 9,859.04 × 4,311.31
4. Step 4: Simplify right side
   7,143.98x = 42,505,336.72
5. Step 5: Solve for x
   x = 42,505,336.72/7,143.98
6. Step 6: Final answer
   x = 5,949.81