Finding the Third Proportional to 3,609.56 and 7,679.81

Step by Step Solution

1. Step 1: Write the proportion equation
   3,609.56 : 7,679.81 = 7,679.81 : x
2. Step 2: Convert to fraction form
   3,609.56/7,679.81 = 7,679.81/x
3. Step 3: Cross multiply
   3,609.56x = 7,679.81 × 7,679.81
4. Step 4: Simplify right side
   3,609.56x = 58,979,520.04
5. Step 5: Solve for x
   x = 58,979,520.04/3,609.56
6. Step 6: Final answer
   x = 16,339.80