Finding the Third Proportional to 8,691.05 and 12,091.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,691.05 : 12,091.15 = 12,091.15 : x
2. Step 2: Convert to fraction form
   8,691.05/12,091.15 = 12,091.15/x
3. Step 3: Cross multiply
   8,691.05x = 12,091.15 × 12,091.15
4. Step 4: Simplify right side
   8,691.05x = 146,195,870.54
5. Step 5: Solve for x
   x = 146,195,870.54/8,691.05
6. Step 6: Final answer
   x = 16,821.43