Finding the Third Proportional to 339,426 and 702,328.50

Step by Step Solution

1. Step 1: Write the proportion equation
   339,426 : 702,328.50 = 702,328.50 : x
2. Step 2: Convert to fraction form
   339,426/702,328.50 = 702,328.50/x
3. Step 3: Cross multiply
   339,426x = 702,328.50 × 702,328.50
4. Step 4: Simplify right side
   339,426x = 493,265,321,912.25
5. Step 5: Solve for x
   x = 493,265,321,912.25/339,426
6. Step 6: Final answer
   x = 1,453,233.76