Finding the Third Proportional to 339,408 and 503,239.50

Step by Step Solution

1. Step 1: Write the proportion equation
   339,408 : 503,239.50 = 503,239.50 : x
2. Step 2: Convert to fraction form
   339,408/503,239.50 = 503,239.50/x
3. Step 3: Cross multiply
   339,408x = 503,239.50 × 503,239.50
4. Step 4: Simplify right side
   339,408x = 253,249,994,360.25
5. Step 5: Solve for x
   x = 253,249,994,360.25/339,408
6. Step 6: Final answer
   x = 746,152.11