Finding the Third Proportional to 253,687 and 390,067.50

Step by Step Solution

1. Step 1: Write the proportion equation
   253,687 : 390,067.50 = 390,067.50 : x
2. Step 2: Convert to fraction form
   253,687/390,067.50 = 390,067.50/x
3. Step 3: Cross multiply
   253,687x = 390,067.50 × 390,067.50
4. Step 4: Simplify right side
   253,687x = 152,152,654,556.25
5. Step 5: Solve for x
   x = 152,152,654,556.25/253,687
6. Step 6: Final answer
   x = 599,765.28