Finding the Third Proportional to 81,511.50 and 172,836

Step by Step Solution

1. Step 1: Write the proportion equation
   81,511.50 : 172,836 = 172,836 : x
2. Step 2: Convert to fraction form
   81,511.50/172,836 = 172,836/x
3. Step 3: Cross multiply
   81,511.50x = 172,836 × 172,836
4. Step 4: Simplify right side
   81,511.50x = 29,872,282,896
5. Step 5: Solve for x
   x = 29,872,282,896/81,511.50
6. Step 6: Final answer
   x = 366,479.37