Finding the Third Proportional to 111,139 and 172,349

Step by Step Solution

1. Step 1: Write the proportion equation
   111,139 : 172,349 = 172,349 : x
2. Step 2: Convert to fraction form
   111,139/172,349 = 172,349/x
3. Step 3: Cross multiply
   111,139x = 172,349 × 172,349
4. Step 4: Simplify right side
   111,139x = 29,704,177,801
5. Step 5: Solve for x
   x = 29,704,177,801/111,139
6. Step 6: Final answer
   x = 267,270.52