Finding the Third Proportional to 11,121.75 and 21,150

Step by Step Solution

1. Step 1: Write the proportion equation
   11,121.75 : 21,150 = 21,150 : x
2. Step 2: Convert to fraction form
   11,121.75/21,150 = 21,150/x
3. Step 3: Cross multiply
   11,121.75x = 21,150 × 21,150
4. Step 4: Simplify right side
   11,121.75x = 447,322,500
5. Step 5: Solve for x
   x = 447,322,500/11,121.75
6. Step 6: Final answer
   x = 40,220.51