Finding the Third Proportional to 13,706.72 and 20,661.33

Step by Step Solution

1. Step 1: Write the proportion equation
   13,706.72 : 20,661.33 = 20,661.33 : x
2. Step 2: Convert to fraction form
   13,706.72/20,661.33 = 20,661.33/x
3. Step 3: Cross multiply
   13,706.72x = 20,661.33 × 20,661.33
4. Step 4: Simplify right side
   13,706.72x = 426,890,479.89
5. Step 5: Solve for x
   x = 426,890,479.89/13,706.72
6. Step 6: Final answer
   x = 31,144.62