Finding the Third Proportional to 250,515 and 387,945

Step by Step Solution

1. Step 1: Write the proportion equation
   250,515 : 387,945 = 387,945 : x
2. Step 2: Convert to fraction form
   250,515/387,945 = 387,945/x
3. Step 3: Cross multiply
   250,515x = 387,945 × 387,945
4. Step 4: Simplify right side
   250,515x = 150,501,323,025
5. Step 5: Solve for x
   x = 150,501,323,025/250,515
6. Step 6: Final answer
   x = 600,767.71