Finding the Third Proportional to 172,240 and 231,456

Step by Step Solution

1. Step 1: Write the proportion equation
   172,240 : 231,456 = 231,456 : x
2. Step 2: Convert to fraction form
   172,240/231,456 = 231,456/x
3. Step 3: Cross multiply
   172,240x = 231,456 × 231,456
4. Step 4: Simplify right side
   172,240x = 53,571,879,936
5. Step 5: Solve for x
   x = 53,571,879,936/172,240
6. Step 6: Final answer
   x = 311,030.42