Finding the Fourth Proportional to 2,478.53, 3,720.53 and 1,439.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,478.53 : 3,720.53 = 1,439.71 : x
2. Step 2: Convert to fraction form
   2,478.53/3,720.53 = 1,439.71/x
3. Step 3: Cross multiply
   2,478.53x = 3,720.53 × 1,439.71
4. Step 4: Simplify right side
   2,478.53x = 5,356,478.54
5. Step 5: Solve for x
   x = 5,356,478.54/2,478.53
6. Step 6: Final answer
   x = 2,161.15