Finding the Third Proportional to 316,942.88 and 687,626.72

Step by Step Solution

1. Step 1: Write the proportion equation
   316,942.88 : 687,626.72 = 687,626.72 : x
2. Step 2: Convert to fraction form
   316,942.88/687,626.72 = 687,626.72/x
3. Step 3: Cross multiply
   316,942.88x = 687,626.72 × 687,626.72
4. Step 4: Simplify right side
   316,942.88x = 472,830,504,338.89
5. Step 5: Solve for x
   x = 472,830,504,338.89/316,942.88
6. Step 6: Final answer
   x = 1,491,847.72