Finding the Third Proportional to 256,594.50 and 558,360

Step by Step Solution

1. Step 1: Write the proportion equation
   256,594.50 : 558,360 = 558,360 : x
2. Step 2: Convert to fraction form
   256,594.50/558,360 = 558,360/x
3. Step 3: Cross multiply
   256,594.50x = 558,360 × 558,360
4. Step 4: Simplify right side
   256,594.50x = 311,765,889,600
5. Step 5: Solve for x
   x = 311,765,889,600/256,594.50
6. Step 6: Final answer
   x = 1,215,013.92