Finding the Third Proportional to 13,656.38 and 20,609.63

Step by Step Solution

1. Step 1: Write the proportion equation
   13,656.38 : 20,609.63 = 20,609.63 : x
2. Step 2: Convert to fraction form
   13,656.38/20,609.63 = 20,609.63/x
3. Step 3: Cross multiply
   13,656.38x = 20,609.63 × 20,609.63
4. Step 4: Simplify right side
   13,656.38x = 424,756,642.64
5. Step 5: Solve for x
   x = 424,756,642.64/13,656.38
6. Step 6: Final answer
   x = 31,103.18