Finding the Fourth Proportional to 2,558.34, 3,529.71 and 1,439.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.34 : 3,529.71 = 1,439.10 : x
2. Step 2: Convert to fraction form
   2,558.34/3,529.71 = 1,439.10/x
3. Step 3: Cross multiply
   2,558.34x = 3,529.71 × 1,439.10
4. Step 4: Simplify right side
   2,558.34x = 5,079,605.66
5. Step 5: Solve for x
   x = 5,079,605.66/2,558.34
6. Step 6: Final answer
   x = 1,985.51