Finding the Fourth Proportional to 2,609.85, 3,911.31 and 1,440.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,609.85 : 3,911.31 = 1,440.12 : x
2. Step 2: Convert to fraction form
   2,609.85/3,911.31 = 1,440.12/x
3. Step 3: Cross multiply
   2,609.85x = 3,911.31 × 1,440.12
4. Step 4: Simplify right side
   2,609.85x = 5,632,755.76
5. Step 5: Solve for x
   x = 5,632,755.76/2,609.85
6. Step 6: Final answer
   x = 2,158.27