Finding the Third Proportional to 217,647 and 308,245.50

Step by Step Solution

1. Step 1: Write the proportion equation
   217,647 : 308,245.50 = 308,245.50 : x
2. Step 2: Convert to fraction form
   217,647/308,245.50 = 308,245.50/x
3. Step 3: Cross multiply
   217,647x = 308,245.50 × 308,245.50
4. Step 4: Simplify right side
   217,647x = 95,015,288,270.25
5. Step 5: Solve for x
   x = 95,015,288,270.25/217,647
6. Step 6: Final answer
   x = 436,556.85