Finding the Fourth Proportional to 2,139.27, 3,211.62 and 1,440.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,139.27 : 3,211.62 = 1,440.96 : x
2. Step 2: Convert to fraction form
   2,139.27/3,211.62 = 1,440.96/x
3. Step 3: Cross multiply
   2,139.27x = 3,211.62 × 1,440.96
4. Step 4: Simplify right side
   2,139.27x = 4,627,815.96
5. Step 5: Solve for x
   x = 4,627,815.96/2,139.27
6. Step 6: Final answer
   x = 2,163.27