Finding the Third Proportional to 21.09 and 43.88

Step by Step Solution

1. Step 1: Write the proportion equation
   21.09 : 43.88 = 43.88 : x
2. Step 2: Convert to fraction form
   21.09/43.88 = 43.88/x
3. Step 3: Cross multiply
   21.09x = 43.88 × 43.88
4. Step 4: Simplify right side
   21.09x = 1,925.02
5. Step 5: Solve for x
   x = 1,925.02/21.09
6. Step 6: Final answer
   x = 91.26