Finding the Third Proportional to 78,144 and 171,192

Step by Step Solution

1. Step 1: Write the proportion equation
   78,144 : 171,192 = 171,192 : x
2. Step 2: Convert to fraction form
   78,144/171,192 = 171,192/x
3. Step 3: Cross multiply
   78,144x = 171,192 × 171,192
4. Step 4: Simplify right side
   78,144x = 29,306,700,864
5. Step 5: Solve for x
   x = 29,306,700,864/78,144
6. Step 6: Final answer
   x = 375,034.56