Finding the Third Proportional to 171,720 and 262,678.50

Step by Step Solution

1. Step 1: Write the proportion equation
   171,720 : 262,678.50 = 262,678.50 : x
2. Step 2: Convert to fraction form
   171,720/262,678.50 = 262,678.50/x
3. Step 3: Cross multiply
   171,720x = 262,678.50 × 262,678.50
4. Step 4: Simplify right side
   171,720x = 68,999,994,362.25
5. Step 5: Solve for x
   x = 68,999,994,362.25/171,720
6. Step 6: Final answer
   x = 401,816.88