Finding the Third Proportional to 155,315.50 and 339,709.50

Step by Step Solution

1. Step 1: Write the proportion equation
   155,315.50 : 339,709.50 = 339,709.50 : x
2. Step 2: Convert to fraction form
   155,315.50/339,709.50 = 339,709.50/x
3. Step 3: Cross multiply
   155,315.50x = 339,709.50 × 339,709.50
4. Step 4: Simplify right side
   155,315.50x = 115,402,544,390.25
5. Step 5: Solve for x
   x = 115,402,544,390.25/155,315.50
6. Step 6: Final answer
   x = 743,020.14