Finding the Third Proportional to 339,417 and 706,405.50

Step by Step Solution

1. Step 1: Write the proportion equation
   339,417 : 706,405.50 = 706,405.50 : x
2. Step 2: Convert to fraction form
   339,417/706,405.50 = 706,405.50/x
3. Step 3: Cross multiply
   339,417x = 706,405.50 × 706,405.50
4. Step 4: Simplify right side
   339,417x = 499,008,730,430.25
5. Step 5: Solve for x
   x = 499,008,730,430.25/339,417
6. Step 6: Final answer
   x = 1,470,193.69