Finding the Third Proportional to 311,215.50 and 682,695

Step by Step Solution

1. Step 1: Write the proportion equation
   311,215.50 : 682,695 = 682,695 : x
2. Step 2: Convert to fraction form
   311,215.50/682,695 = 682,695/x
3. Step 3: Cross multiply
   311,215.50x = 682,695 × 682,695
4. Step 4: Simplify right side
   311,215.50x = 466,072,463,025
5. Step 5: Solve for x
   x = 466,072,463,025/311,215.50
6. Step 6: Final answer
   x = 1,497,587.57