Finding the Third Proportional to 215,556 and 326,315.50

Step by Step Solution

1. Step 1: Write the proportion equation
   215,556 : 326,315.50 = 326,315.50 : x
2. Step 2: Convert to fraction form
   215,556/326,315.50 = 326,315.50/x
3. Step 3: Cross multiply
   215,556x = 326,315.50 × 326,315.50
4. Step 4: Simplify right side
   215,556x = 106,481,805,540.25
5. Step 5: Solve for x
   x = 106,481,805,540.25/215,556
6. Step 6: Final answer
   x = 493,986.74