Finding the Fourth Proportional to 2,558.31, 3,530.46 and 1,439.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.31 : 3,530.46 = 1,439.25 : x
2. Step 2: Convert to fraction form
   2,558.31/3,530.46 = 1,439.25/x
3. Step 3: Cross multiply
   2,558.31x = 3,530.46 × 1,439.25
4. Step 4: Simplify right side
   2,558.31x = 5,081,214.56
5. Step 5: Solve for x
   x = 5,081,214.56/2,558.31
6. Step 6: Final answer
   x = 1,986.16