Finding the Third Proportional to 253,309.25 and 395,300

Step by Step Solution

1. Step 1: Write the proportion equation
   253,309.25 : 395,300 = 395,300 : x
2. Step 2: Convert to fraction form
   253,309.25/395,300 = 395,300/x
3. Step 3: Cross multiply
   253,309.25x = 395,300 × 395,300
4. Step 4: Simplify right side
   253,309.25x = 156,262,090,000
5. Step 5: Solve for x
   x = 156,262,090,000/253,309.25
6. Step 6: Final answer
   x = 616,882.68