Finding the Third Proportional to 316,945.50 and 687,633

Step by Step Solution

1. Step 1: Write the proportion equation
   316,945.50 : 687,633 = 687,633 : x
2. Step 2: Convert to fraction form
   316,945.50/687,633 = 687,633/x
3. Step 3: Cross multiply
   316,945.50x = 687,633 × 687,633
4. Step 4: Simplify right side
   316,945.50x = 472,839,142,689
5. Step 5: Solve for x
   x = 472,839,142,689/316,945.50
6. Step 6: Final answer
   x = 1,491,862.62