Finding the Third Proportional to 155,299.50 and 339,678

Step by Step Solution

1. Step 1: Write the proportion equation
   155,299.50 : 339,678 = 339,678 : x
2. Step 2: Convert to fraction form
   155,299.50/339,678 = 339,678/x
3. Step 3: Cross multiply
   155,299.50x = 339,678 × 339,678
4. Step 4: Simplify right side
   155,299.50x = 115,381,143,684
5. Step 5: Solve for x
   x = 115,381,143,684/155,299.50
6. Step 6: Final answer
   x = 742,958.89