Finding the Third Proportional to 315,092 and 691,410

Step by Step Solution

1. Step 1: Write the proportion equation
   315,092 : 691,410 = 691,410 : x
2. Step 2: Convert to fraction form
   315,092/691,410 = 691,410/x
3. Step 3: Cross multiply
   315,092x = 691,410 × 691,410
4. Step 4: Simplify right side
   315,092x = 478,047,788,100
5. Step 5: Solve for x
   x = 478,047,788,100/315,092
6. Step 6: Final answer
   x = 1,517,168.92