Finding the Third Proportional to 8,780.91 and 20,872.69

Step by Step Solution

1. Step 1: Write the proportion equation
   8,780.91 : 20,872.69 = 20,872.69 : x
2. Step 2: Convert to fraction form
   8,780.91/20,872.69 = 20,872.69/x
3. Step 3: Cross multiply
   8,780.91x = 20,872.69 × 20,872.69
4. Step 4: Simplify right side
   8,780.91x = 435,669,083.47
5. Step 5: Solve for x
   x = 435,669,083.47/8,780.91
6. Step 6: Final answer
   x = 49,615.50