Finding the Fourth Proportional to 2,557.98, 3,530.14 and 1,439.27

Step by Step Solution

1. Step 1: Write the proportion equation
   2,557.98 : 3,530.14 = 1,439.27 : x
2. Step 2: Convert to fraction form
   2,557.98/3,530.14 = 1,439.27/x
3. Step 3: Cross multiply
   2,557.98x = 3,530.14 × 1,439.27
4. Step 4: Simplify right side
   2,557.98x = 5,080,824.60
5. Step 5: Solve for x
   x = 5,080,824.60/2,557.98
6. Step 6: Final answer
   x = 1,986.26