Finding the Third Proportional to 13,509.25 and 20,209.88

Step by Step Solution

1. Step 1: Write the proportion equation
   13,509.25 : 20,209.88 = 20,209.88 : x
2. Step 2: Convert to fraction form
   13,509.25/20,209.88 = 20,209.88/x
3. Step 3: Cross multiply
   13,509.25x = 20,209.88 × 20,209.88
4. Step 4: Simplify right side
   13,509.25x = 408,439,047.52
5. Step 5: Solve for x
   x = 408,439,047.52/13,509.25
6. Step 6: Final answer
   x = 30,234.03