Finding the Third Proportional to 171,211 and 263,499

Step by Step Solution

1. Step 1: Write the proportion equation
   171,211 : 263,499 = 263,499 : x
2. Step 2: Convert to fraction form
   171,211/263,499 = 263,499/x
3. Step 3: Cross multiply
   171,211x = 263,499 × 263,499
4. Step 4: Simplify right side
   171,211x = 69,431,723,001
5. Step 5: Solve for x
   x = 69,431,723,001/171,211
6. Step 6: Final answer
   x = 405,533.07