Finding the Third Proportional to 215,676 and 315,792

Step by Step Solution

1. Step 1: Write the proportion equation
   215,676 : 315,792 = 315,792 : x
2. Step 2: Convert to fraction form
   215,676/315,792 = 315,792/x
3. Step 3: Cross multiply
   215,676x = 315,792 × 315,792
4. Step 4: Simplify right side
   215,676x = 99,724,587,264
5. Step 5: Solve for x
   x = 99,724,587,264/215,676
6. Step 6: Final answer
   x = 462,381.48