Finding the Third Proportional to 108,718.50 and 172,959.50

Step by Step Solution

1. Step 1: Write the proportion equation
   108,718.50 : 172,959.50 = 172,959.50 : x
2. Step 2: Convert to fraction form
   108,718.50/172,959.50 = 172,959.50/x
3. Step 3: Cross multiply
   108,718.50x = 172,959.50 × 172,959.50
4. Step 4: Simplify right side
   108,718.50x = 29,914,988,640.25
5. Step 5: Solve for x
   x = 29,914,988,640.25/108,718.50
6. Step 6: Final answer
   x = 275,160.06