Finding the Third Proportional to 144,288 and 309,312

Step by Step Solution

1. Step 1: Write the proportion equation
   144,288 : 309,312 = 309,312 : x
2. Step 2: Convert to fraction form
   144,288/309,312 = 309,312/x
3. Step 3: Cross multiply
   144,288x = 309,312 × 309,312
4. Step 4: Simplify right side
   144,288x = 95,673,913,344
5. Step 5: Solve for x
   x = 95,673,913,344/144,288
6. Step 6: Final answer
   x = 663,076.02