Finding the Third Proportional to 152,718 and 315,912

Step by Step Solution

1. Step 1: Write the proportion equation
   152,718 : 315,912 = 315,912 : x
2. Step 2: Convert to fraction form
   152,718/315,912 = 315,912/x
3. Step 3: Cross multiply
   152,718x = 315,912 × 315,912
4. Step 4: Simplify right side
   152,718x = 99,800,391,744
5. Step 5: Solve for x
   x = 99,800,391,744/152,718
6. Step 6: Final answer
   x = 653,494.62