Finding the Fourth Proportional to 3,939.71, 5,436.81 and 2,171.27

Step by Step Solution

1. Step 1: Write the proportion equation
   3,939.71 : 5,436.81 = 2,171.27 : x
2. Step 2: Convert to fraction form
   3,939.71/5,436.81 = 2,171.27/x
3. Step 3: Cross multiply
   3,939.71x = 5,436.81 × 2,171.27
4. Step 4: Simplify right side
   3,939.71x = 11,804,796.04
5. Step 5: Solve for x
   x = 11,804,796.04/3,939.71
6. Step 6: Final answer
   x = 2,996.37