Finding the Third Proportional to 13,604 and 20,808.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,604 : 20,808.50 = 20,808.50 : x
2. Step 2: Convert to fraction form
   13,604/20,808.50 = 20,808.50/x
3. Step 3: Cross multiply
   13,604x = 20,808.50 × 20,808.50
4. Step 4: Simplify right side
   13,604x = 432,993,672.25
5. Step 5: Solve for x
   x = 432,993,672.25/13,604
6. Step 6: Final answer
   x = 31,828.41