Finding the Fourth Proportional to 3,939.50, 5,436.52 and 2,171.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,939.50 : 5,436.52 = 2,171.10 : x
2. Step 2: Convert to fraction form
   3,939.50/5,436.52 = 2,171.10/x
3. Step 3: Cross multiply
   3,939.50x = 5,436.52 × 2,171.10
4. Step 4: Simplify right side
   3,939.50x = 11,803,228.57
5. Step 5: Solve for x
   x = 11,803,228.57/3,939.50
6. Step 6: Final answer
   x = 2,996.12