Finding the Third Proportional to 253,315 and 395,308.50

Step by Step Solution

1. Step 1: Write the proportion equation
   253,315 : 395,308.50 = 395,308.50 : x
2. Step 2: Convert to fraction form
   253,315/395,308.50 = 395,308.50/x
3. Step 3: Cross multiply
   253,315x = 395,308.50 × 395,308.50
4. Step 4: Simplify right side
   253,315x = 156,268,810,172.25
5. Step 5: Solve for x
   x = 156,268,810,172.25/253,315
6. Step 6: Final answer
   x = 616,895.21