Finding the Third Proportional to 312,136.50 and 682,059

Step by Step Solution

1. Step 1: Write the proportion equation
   312,136.50 : 682,059 = 682,059 : x
2. Step 2: Convert to fraction form
   312,136.50/682,059 = 682,059/x
3. Step 3: Cross multiply
   312,136.50x = 682,059 × 682,059
4. Step 4: Simplify right side
   312,136.50x = 465,204,479,481
5. Step 5: Solve for x
   x = 465,204,479,481/312,136.50
6. Step 6: Final answer
   x = 1,490,387.95