Finding the Fourth Proportional to 3,942.72, 5,440.98 and 2,174.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,942.72 : 5,440.98 = 2,174.31 : x
2. Step 2: Convert to fraction form
   3,942.72/5,440.98 = 2,174.31/x
3. Step 3: Cross multiply
   3,942.72x = 5,440.98 × 2,174.31
4. Step 4: Simplify right side
   3,942.72x = 11,830,377.22
5. Step 5: Solve for x
   x = 11,830,377.22/3,942.72
6. Step 6: Final answer
   x = 3,000.56