Finding the Third Proportional to 3,872.81 and 8,672.06

Step by Step Solution

1. Step 1: Write the proportion equation
   3,872.81 : 8,672.06 = 8,672.06 : x
2. Step 2: Convert to fraction form
   3,872.81/8,672.06 = 8,672.06/x
3. Step 3: Cross multiply
   3,872.81x = 8,672.06 × 8,672.06
4. Step 4: Simplify right side
   3,872.81x = 75,204,668.00
5. Step 5: Solve for x
   x = 75,204,668.00/3,872.81
6. Step 6: Final answer
   x = 19,418.62