Finding the Third Proportional to 3,754.69 and 8,691.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,754.69 : 8,691.89 = 8,691.89 : x
2. Step 2: Convert to fraction form
   3,754.69/8,691.89 = 8,691.89/x
3. Step 3: Cross multiply
   3,754.69x = 8,691.89 × 8,691.89
4. Step 4: Simplify right side
   3,754.69x = 75,548,962.64
5. Step 5: Solve for x
   x = 75,548,962.64/3,754.69
6. Step 6: Final answer
   x = 20,121.24