Finding the Fourth Proportional to 2,135.40, 3,204.72 and 1,440.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,135.40 : 3,204.72 = 1,440.42 : x
2. Step 2: Convert to fraction form
   2,135.40/3,204.72 = 1,440.42/x
3. Step 3: Cross multiply
   2,135.40x = 3,204.72 × 1,440.42
4. Step 4: Simplify right side
   2,135.40x = 4,616,142.78
5. Step 5: Solve for x
   x = 4,616,142.78/2,135.40
6. Step 6: Final answer
   x = 2,161.72