Finding the Third Proportional to 13,440.94 and 20,209.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,440.94 : 20,209.50 = 20,209.50 : x
2. Step 2: Convert to fraction form
   13,440.94/20,209.50 = 20,209.50/x
3. Step 3: Cross multiply
   13,440.94x = 20,209.50 × 20,209.50
4. Step 4: Simplify right side
   13,440.94x = 408,423,890.25
5. Step 5: Solve for x
   x = 408,423,890.25/13,440.94
6. Step 6: Final answer
   x = 30,386.56