Finding the Third Proportional to 253,305 and 395,293.50

Step by Step Solution

1. Step 1: Write the proportion equation
   253,305 : 395,293.50 = 395,293.50 : x
2. Step 2: Convert to fraction form
   253,305/395,293.50 = 395,293.50/x
3. Step 3: Cross multiply
   253,305x = 395,293.50 × 395,293.50
4. Step 4: Simplify right side
   253,305x = 156,256,951,142.25
5. Step 5: Solve for x
   x = 156,256,951,142.25/253,305
6. Step 6: Final answer
   x = 616,872.75