Finding the Third Proportional to 80,866.50 and 172,819.50

Step by Step Solution

1. Step 1: Write the proportion equation
   80,866.50 : 172,819.50 = 172,819.50 : x
2. Step 2: Convert to fraction form
   80,866.50/172,819.50 = 172,819.50/x
3. Step 3: Cross multiply
   80,866.50x = 172,819.50 × 172,819.50
4. Step 4: Simplify right side
   80,866.50x = 29,866,579,580.25
5. Step 5: Solve for x
   x = 29,866,579,580.25/80,866.50
6. Step 6: Final answer
   x = 369,331.92