Finding the Third Proportional to 154,961.50 and 218,216

Step by Step Solution

1. Step 1: Write the proportion equation
   154,961.50 : 218,216 = 218,216 : x
2. Step 2: Convert to fraction form
   154,961.50/218,216 = 218,216/x
3. Step 3: Cross multiply
   154,961.50x = 218,216 × 218,216
4. Step 4: Simplify right side
   154,961.50x = 47,618,222,656
5. Step 5: Solve for x
   x = 47,618,222,656/154,961.50
6. Step 6: Final answer
   x = 307,290.67