Finding the Third Proportional to 81,559.50 and 172,911

Step by Step Solution

1. Step 1: Write the proportion equation
   81,559.50 : 172,911 = 172,911 : x
2. Step 2: Convert to fraction form
   81,559.50/172,911 = 172,911/x
3. Step 3: Cross multiply
   81,559.50x = 172,911 × 172,911
4. Step 4: Simplify right side
   81,559.50x = 29,898,213,921
5. Step 5: Solve for x
   x = 29,898,213,921/81,559.50
6. Step 6: Final answer
   x = 366,581.62