Finding the Third Proportional to 254,128 and 338,788.50

Step by Step Solution

1. Step 1: Write the proportion equation
   254,128 : 338,788.50 = 338,788.50 : x
2. Step 2: Convert to fraction form
   254,128/338,788.50 = 338,788.50/x
3. Step 3: Cross multiply
   254,128x = 338,788.50 × 338,788.50
4. Step 4: Simplify right side
   254,128x = 114,777,647,732.25
5. Step 5: Solve for x
   x = 114,777,647,732.25/254,128
6. Step 6: Final answer
   x = 451,652.90