Finding the Third Proportional to 80,570.50 and 172,798.50

Step by Step Solution

1. Step 1: Write the proportion equation
   80,570.50 : 172,798.50 = 172,798.50 : x
2. Step 2: Convert to fraction form
   80,570.50/172,798.50 = 172,798.50/x
3. Step 3: Cross multiply
   80,570.50x = 172,798.50 × 172,798.50
4. Step 4: Simplify right side
   80,570.50x = 29,859,321,602.25
5. Step 5: Solve for x
   x = 29,859,321,602.25/80,570.50
6. Step 6: Final answer
   x = 370,598.69