Finding the Fourth Proportional to 3,387.42, 5,077.89 and 1,440.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,387.42 : 5,077.89 = 1,440.72 : x
2. Step 2: Convert to fraction form
   3,387.42/5,077.89 = 1,440.72/x
3. Step 3: Cross multiply
   3,387.42x = 5,077.89 × 1,440.72
4. Step 4: Simplify right side
   3,387.42x = 7,315,817.68
5. Step 5: Solve for x
   x = 7,315,817.68/3,387.42
6. Step 6: Final answer
   x = 2,159.70