Finding the Third Proportional to 212,279.50 and 288,448

Step by Step Solution

1. Step 1: Write the proportion equation
   212,279.50 : 288,448 = 288,448 : x
2. Step 2: Convert to fraction form
   212,279.50/288,448 = 288,448/x
3. Step 3: Cross multiply
   212,279.50x = 288,448 × 288,448
4. Step 4: Simplify right side
   212,279.50x = 83,202,248,704
5. Step 5: Solve for x
   x = 83,202,248,704/212,279.50
6. Step 6: Final answer
   x = 391,946.70