Finding the Third Proportional to 13,609.50 and 20,818.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,609.50 : 20,818.50 = 20,818.50 : x
2. Step 2: Convert to fraction form
   13,609.50/20,818.50 = 20,818.50/x
3. Step 3: Cross multiply
   13,609.50x = 20,818.50 × 20,818.50
4. Step 4: Simplify right side
   13,609.50x = 433,409,942.25
5. Step 5: Solve for x
   x = 433,409,942.25/13,609.50
6. Step 6: Final answer
   x = 31,846.13