Finding the Third Proportional to 312,403.50 and 682,587

Step by Step Solution

1. Step 1: Write the proportion equation
   312,403.50 : 682,587 = 682,587 : x
2. Step 2: Convert to fraction form
   312,403.50/682,587 = 682,587/x
3. Step 3: Cross multiply
   312,403.50x = 682,587 × 682,587
4. Step 4: Simplify right side
   312,403.50x = 465,925,012,569
5. Step 5: Solve for x
   x = 465,925,012,569/312,403.50
6. Step 6: Final answer
   x = 1,491,420.59