Finding the Third Proportional to 215,320 and 308,218

Step by Step Solution

1. Step 1: Write the proportion equation
   215,320 : 308,218 = 308,218 : x
2. Step 2: Convert to fraction form
   215,320/308,218 = 308,218/x
3. Step 3: Cross multiply
   215,320x = 308,218 × 308,218
4. Step 4: Simplify right side
   215,320x = 94,998,335,524
5. Step 5: Solve for x
   x = 94,998,335,524/215,320
6. Step 6: Final answer
   x = 441,196.06