Finding the Third Proportional to 111,356 and 172,218

Step by Step Solution

1. Step 1: Write the proportion equation
   111,356 : 172,218 = 172,218 : x
2. Step 2: Convert to fraction form
   111,356/172,218 = 172,218/x
3. Step 3: Cross multiply
   111,356x = 172,218 × 172,218
4. Step 4: Simplify right side
   111,356x = 29,659,039,524
5. Step 5: Solve for x
   x = 29,659,039,524/111,356
6. Step 6: Final answer
   x = 266,344.33