Finding the Third Proportional to 152,720 and 315,916

Step by Step Solution

1. Step 1: Write the proportion equation
   152,720 : 315,916 = 315,916 : x
2. Step 2: Convert to fraction form
   152,720/315,916 = 315,916/x
3. Step 3: Cross multiply
   152,720x = 315,916 × 315,916
4. Step 4: Simplify right side
   152,720x = 99,802,919,056
5. Step 5: Solve for x
   x = 99,802,919,056/152,720
6. Step 6: Final answer
   x = 653,502.61