Finding the Third Proportional to 256,270.50 and 394,443

Step by Step Solution

1. Step 1: Write the proportion equation
   256,270.50 : 394,443 = 394,443 : x
2. Step 2: Convert to fraction form
   256,270.50/394,443 = 394,443/x
3. Step 3: Cross multiply
   256,270.50x = 394,443 × 394,443
4. Step 4: Simplify right side
   256,270.50x = 155,585,280,249
5. Step 5: Solve for x
   x = 155,585,280,249/256,270.50
6. Step 6: Final answer
   x = 607,113.50