Finding the Third Proportional to 99,387 and 212,169.38

Step by Step Solution

1. Step 1: Write the proportion equation
   99,387 : 212,169.38 = 212,169.38 : x
2. Step 2: Convert to fraction form
   99,387/212,169.38 = 212,169.38/x
3. Step 3: Cross multiply
   99,387x = 212,169.38 × 212,169.38
4. Step 4: Simplify right side
   99,387x = 45,015,843,687.89
5. Step 5: Solve for x
   x = 45,015,843,687.89/99,387
6. Step 6: Final answer
   x = 452,934.93