Finding the Third Proportional to 172,707 and 266,443.50

Step by Step Solution

1. Step 1: Write the proportion equation
   172,707 : 266,443.50 = 266,443.50 : x
2. Step 2: Convert to fraction form
   172,707/266,443.50 = 266,443.50/x
3. Step 3: Cross multiply
   172,707x = 266,443.50 × 266,443.50
4. Step 4: Simplify right side
   172,707x = 70,992,138,692.25
5. Step 5: Solve for x
   x = 70,992,138,692.25/172,707
6. Step 6: Final answer
   x = 411,055.36