Finding the Third Proportional to 424,740 and 642,550.50

Step by Step Solution

1. Step 1: Write the proportion equation
   424,740 : 642,550.50 = 642,550.50 : x
2. Step 2: Convert to fraction form
   424,740/642,550.50 = 642,550.50/x
3. Step 3: Cross multiply
   424,740x = 642,550.50 × 642,550.50
4. Step 4: Simplify right side
   424,740x = 412,871,145,050.25
5. Step 5: Solve for x
   x = 412,871,145,050.25/424,740
6. Step 6: Final answer
   x = 972,056.19