Finding the Third Proportional to 312,783 and 682,912.50

Step by Step Solution

1. Step 1: Write the proportion equation
   312,783 : 682,912.50 = 682,912.50 : x
2. Step 2: Convert to fraction form
   312,783/682,912.50 = 682,912.50/x
3. Step 3: Cross multiply
   312,783x = 682,912.50 × 682,912.50
4. Step 4: Simplify right side
   312,783x = 466,369,482,656.25
5. Step 5: Solve for x
   x = 466,369,482,656.25/312,783
6. Step 6: Final answer
   x = 1,491,032.07