Finding the Third Proportional to 5,239.69 and 10,659.09

Step by Step Solution

1. Step 1: Write the proportion equation
   5,239.69 : 10,659.09 = 10,659.09 : x
2. Step 2: Convert to fraction form
   5,239.69/10,659.09 = 10,659.09/x
3. Step 3: Cross multiply
   5,239.69x = 10,659.09 × 10,659.09
4. Step 4: Simplify right side
   5,239.69x = 113,616,279.57
5. Step 5: Solve for x
   x = 113,616,279.57/5,239.69
6. Step 6: Final answer
   x = 21,683.79