Finding the Third Proportional to 256,429.50 and 558,012

Step by Step Solution

1. Step 1: Write the proportion equation
   256,429.50 : 558,012 = 558,012 : x
2. Step 2: Convert to fraction form
   256,429.50/558,012 = 558,012/x
3. Step 3: Cross multiply
   256,429.50x = 558,012 × 558,012
4. Step 4: Simplify right side
   256,429.50x = 311,377,392,144
5. Step 5: Solve for x
   x = 311,377,392,144/256,429.50
6. Step 6: Final answer
   x = 1,214,280.70