Finding the Third Proportional to 315,067.50 and 691,374

Step by Step Solution

1. Step 1: Write the proportion equation
   315,067.50 : 691,374 = 691,374 : x
2. Step 2: Convert to fraction form
   315,067.50/691,374 = 691,374/x
3. Step 3: Cross multiply
   315,067.50x = 691,374 × 691,374
4. Step 4: Simplify right side
   315,067.50x = 477,998,007,876
5. Step 5: Solve for x
   x = 477,998,007,876/315,067.50
6. Step 6: Final answer
   x = 1,517,128.89