Finding the Third Proportional to 315,682.50 and 670,800

Step by Step Solution

1. Step 1: Write the proportion equation
   315,682.50 : 670,800 = 670,800 : x
2. Step 2: Convert to fraction form
   315,682.50/670,800 = 670,800/x
3. Step 3: Cross multiply
   315,682.50x = 670,800 × 670,800
4. Step 4: Simplify right side
   315,682.50x = 449,972,640,000
5. Step 5: Solve for x
   x = 449,972,640,000/315,682.50
6. Step 6: Final answer
   x = 1,425,396.21