Finding the Third Proportional to 212,279.50 and 288,449

Step by Step Solution

1. Step 1: Write the proportion equation
   212,279.50 : 288,449 = 288,449 : x
2. Step 2: Convert to fraction form
   212,279.50/288,449 = 288,449/x
3. Step 3: Cross multiply
   212,279.50x = 288,449 × 288,449
4. Step 4: Simplify right side
   212,279.50x = 83,202,825,601
5. Step 5: Solve for x
   x = 83,202,825,601/212,279.50
6. Step 6: Final answer
   x = 391,949.41