Finding the Third Proportional to 172,669.50 and 262,605

Step by Step Solution

1. Step 1: Write the proportion equation
   172,669.50 : 262,605 = 262,605 : x
2. Step 2: Convert to fraction form
   172,669.50/262,605 = 262,605/x
3. Step 3: Cross multiply
   172,669.50x = 262,605 × 262,605
4. Step 4: Simplify right side
   172,669.50x = 68,961,386,025
5. Step 5: Solve for x
   x = 68,961,386,025/172,669.50
6. Step 6: Final answer
   x = 399,383.71