Finding the Third Proportional to 339,434 and 670,300

Step by Step Solution

1. Step 1: Write the proportion equation
   339,434 : 670,300 = 670,300 : x
2. Step 2: Convert to fraction form
   339,434/670,300 = 670,300/x
3. Step 3: Cross multiply
   339,434x = 670,300 × 670,300
4. Step 4: Simplify right side
   339,434x = 449,302,090,000
5. Step 5: Solve for x
   x = 449,302,090,000/339,434
6. Step 6: Final answer
   x = 1,323,680.27