Finding the Third Proportional to 312,756 and 682,870

Step by Step Solution

1. Step 1: Write the proportion equation
   312,756 : 682,870 = 682,870 : x
2. Step 2: Convert to fraction form
   312,756/682,870 = 682,870/x
3. Step 3: Cross multiply
   312,756x = 682,870 × 682,870
4. Step 4: Simplify right side
   312,756x = 466,311,436,900
5. Step 5: Solve for x
   x = 466,311,436,900/312,756
6. Step 6: Final answer
   x = 1,490,975.19