Finding the Third Proportional to 315,436 and 691,942

Step by Step Solution

1. Step 1: Write the proportion equation
   315,436 : 691,942 = 691,942 : x
2. Step 2: Convert to fraction form
   315,436/691,942 = 691,942/x
3. Step 3: Cross multiply
   315,436x = 691,942 × 691,942
4. Step 4: Simplify right side
   315,436x = 478,783,731,364
5. Step 5: Solve for x
   x = 478,783,731,364/315,436
6. Step 6: Final answer
   x = 1,517,847.46