Finding the Third Proportional to 339,369 and 670,171.50

Step by Step Solution

1. Step 1: Write the proportion equation
   339,369 : 670,171.50 = 670,171.50 : x
2. Step 2: Convert to fraction form
   339,369/670,171.50 = 670,171.50/x
3. Step 3: Cross multiply
   339,369x = 670,171.50 × 670,171.50
4. Step 4: Simplify right side
   339,369x = 449,129,839,412.25
5. Step 5: Solve for x
   x = 449,129,839,412.25/339,369
6. Step 6: Final answer
   x = 1,323,426.24