Finding the Third Proportional to 132,721 and 288,766

Step by Step Solution

1. Step 1: Write the proportion equation
   132,721 : 288,766 = 288,766 : x
2. Step 2: Convert to fraction form
   132,721/288,766 = 288,766/x
3. Step 3: Cross multiply
   132,721x = 288,766 × 288,766
4. Step 4: Simplify right side
   132,721x = 83,385,802,756
5. Step 5: Solve for x
   x = 83,385,802,756/132,721
6. Step 6: Final answer
   x = 628,278.89