Finding the Third Proportional to 155,320.50 and 339,720

Step by Step Solution

1. Step 1: Write the proportion equation
   155,320.50 : 339,720 = 339,720 : x
2. Step 2: Convert to fraction form
   155,320.50/339,720 = 339,720/x
3. Step 3: Cross multiply
   155,320.50x = 339,720 × 339,720
4. Step 4: Simplify right side
   155,320.50x = 115,409,678,400
5. Step 5: Solve for x
   x = 115,409,678,400/155,320.50
6. Step 6: Final answer
   x = 743,042.15