Finding the Third Proportional to 19.88 and 42.25

Step by Step Solution

1. Step 1: Write the proportion equation
   19.88 : 42.25 = 42.25 : x
2. Step 2: Convert to fraction form
   19.88/42.25 = 42.25/x
3. Step 3: Cross multiply
   19.88x = 42.25 × 42.25
4. Step 4: Simplify right side
   19.88x = 1,785.06
5. Step 5: Solve for x
   x = 1,785.06/19.88
6. Step 6: Final answer
   x = 89.81