Finding the Third Proportional to 339,404.50 and 670,242.50

Step by Step Solution

1. Step 1: Write the proportion equation
   339,404.50 : 670,242.50 = 670,242.50 : x
2. Step 2: Convert to fraction form
   339,404.50/670,242.50 = 670,242.50/x
3. Step 3: Cross multiply
   339,404.50x = 670,242.50 × 670,242.50
4. Step 4: Simplify right side
   339,404.50x = 449,225,008,806.25
5. Step 5: Solve for x
   x = 449,225,008,806.25/339,404.50
6. Step 6: Final answer
   x = 1,323,568.22