Finding the Third Proportional to 315,853.50 and 690,756

Step by Step Solution

1. Step 1: Write the proportion equation
   315,853.50 : 690,756 = 690,756 : x
2. Step 2: Convert to fraction form
   315,853.50/690,756 = 690,756/x
3. Step 3: Cross multiply
   315,853.50x = 690,756 × 690,756
4. Step 4: Simplify right side
   315,853.50x = 477,143,851,536
5. Step 5: Solve for x
   x = 477,143,851,536/315,853.50
6. Step 6: Final answer
   x = 1,510,649.25