Finding the Third Proportional to 144,578 and 216,099

Step by Step Solution

1. Step 1: Write the proportion equation
   144,578 : 216,099 = 216,099 : x
2. Step 2: Convert to fraction form
   144,578/216,099 = 216,099/x
3. Step 3: Cross multiply
   144,578x = 216,099 × 216,099
4. Step 4: Simplify right side
   144,578x = 46,698,777,801
5. Step 5: Solve for x
   x = 46,698,777,801/144,578
6. Step 6: Final answer
   x = 323,000.58