Finding the Third Proportional to 8,506.69 and 13,220.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,506.69 : 13,220.72 = 13,220.72 : x
2. Step 2: Convert to fraction form
   8,506.69/13,220.72 = 13,220.72/x
3. Step 3: Cross multiply
   8,506.69x = 13,220.72 × 13,220.72
4. Step 4: Simplify right side
   8,506.69x = 174,787,404.27
5. Step 5: Solve for x
   x = 174,787,404.27/8,506.69
6. Step 6: Final answer
   x = 20,547.06