Finding the Third Proportional to 12,190.50 and 21,921

Step by Step Solution

1. Step 1: Write the proportion equation
   12,190.50 : 21,921 = 21,921 : x
2. Step 2: Convert to fraction form
   12,190.50/21,921 = 21,921/x
3. Step 3: Cross multiply
   12,190.50x = 21,921 × 21,921
4. Step 4: Simplify right side
   12,190.50x = 480,530,241
5. Step 5: Solve for x
   x = 480,530,241/12,190.50
6. Step 6: Final answer
   x = 39,418.42