Finding the Third Proportional to 111,222.70 and 172,363.78

Step by Step Solution

1. Step 1: Write the proportion equation
   111,222.70 : 172,363.78 = 172,363.78 : x
2. Step 2: Convert to fraction form
   111,222.70/172,363.78 = 172,363.78/x
3. Step 3: Cross multiply
   111,222.70x = 172,363.78 × 172,363.78
4. Step 4: Simplify right side
   111,222.70x = 29,709,273,086.80
5. Step 5: Solve for x
   x = 29,709,273,086.80/111,222.70
6. Step 6: Final answer
   x = 267,115.19