Finding the Third Proportional to 81,553.50 and 172,908

Step by Step Solution

1. Step 1: Write the proportion equation
   81,553.50 : 172,908 = 172,908 : x
2. Step 2: Convert to fraction form
   81,553.50/172,908 = 172,908/x
3. Step 3: Cross multiply
   81,553.50x = 172,908 × 172,908
4. Step 4: Simplify right side
   81,553.50x = 29,897,176,464
5. Step 5: Solve for x
   x = 29,897,176,464/81,553.50
6. Step 6: Final answer
   x = 366,595.87