Finding the Third Proportional to 21.94 and 43.56

Step by Step Solution

1. Step 1: Write the proportion equation
   21.94 : 43.56 = 43.56 : x
2. Step 2: Convert to fraction form
   21.94/43.56 = 43.56/x
3. Step 3: Cross multiply
   21.94x = 43.56 × 43.56
4. Step 4: Simplify right side
   21.94x = 1,897.35
5. Step 5: Solve for x
   x = 1,897.35/21.94
6. Step 6: Final answer
   x = 86.49