Finding the Third Proportional to 3,987.67 and 8,666.37

Step by Step Solution

1. Step 1: Write the proportion equation
   3,987.67 : 8,666.37 = 8,666.37 : x
2. Step 2: Convert to fraction form
   3,987.67/8,666.37 = 8,666.37/x
3. Step 3: Cross multiply
   3,987.67x = 8,666.37 × 8,666.37
4. Step 4: Simplify right side
   3,987.67x = 75,105,920.23
5. Step 5: Solve for x
   x = 75,105,920.23/3,987.67
6. Step 6: Final answer
   x = 18,834.55