Finding the Third Proportional to 256,427.50 and 558,008

Step by Step Solution

1. Step 1: Write the proportion equation
   256,427.50 : 558,008 = 558,008 : x
2. Step 2: Convert to fraction form
   256,427.50/558,008 = 558,008/x
3. Step 3: Cross multiply
   256,427.50x = 558,008 × 558,008
4. Step 4: Simplify right side
   256,427.50x = 311,372,928,064
5. Step 5: Solve for x
   x = 311,372,928,064/256,427.50
6. Step 6: Final answer
   x = 1,214,272.76