Finding the Fourth Proportional to 3,711.22, 5,121.57 and 2,139.46

Step by Step Solution

1. Step 1: Write the proportion equation
   3,711.22 : 5,121.57 = 2,139.46 : x
2. Step 2: Convert to fraction form
   3,711.22/5,121.57 = 2,139.46/x
3. Step 3: Cross multiply
   3,711.22x = 5,121.57 × 2,139.46
4. Step 4: Simplify right side
   3,711.22x = 10,957,394.15
5. Step 5: Solve for x
   x = 10,957,394.15/3,711.22
6. Step 6: Final answer
   x = 2,952.50