Finding the Third Proportional to 9,144.75 and 12,421.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,144.75 : 12,421.50 = 12,421.50 : x
2. Step 2: Convert to fraction form
   9,144.75/12,421.50 = 12,421.50/x
3. Step 3: Cross multiply
   9,144.75x = 12,421.50 × 12,421.50
4. Step 4: Simplify right side
   9,144.75x = 154,293,662.25
5. Step 5: Solve for x
   x = 154,293,662.25/9,144.75
6. Step 6: Final answer
   x = 16,872.38