Finding the Fourth Proportional to 2,558.28, 3,530.01 and 1,439.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,558.28 : 3,530.01 = 1,439.07 : x
2. Step 2: Convert to fraction form
   2,558.28/3,530.01 = 1,439.07/x
3. Step 3: Cross multiply
   2,558.28x = 3,530.01 × 1,439.07
4. Step 4: Simplify right side
   2,558.28x = 5,079,931.49
5. Step 5: Solve for x
   x = 5,079,931.49/2,558.28
6. Step 6: Final answer
   x = 1,985.68