Finding the Third Proportional to 19.37 and 42.20

Step by Step Solution

1. Step 1: Write the proportion equation
   19.37 : 42.20 = 42.20 : x
2. Step 2: Convert to fraction form
   19.37/42.20 = 42.20/x
3. Step 3: Cross multiply
   19.37x = 42.20 × 42.20
4. Step 4: Simplify right side
   19.37x = 1,780.64
5. Step 5: Solve for x
   x = 1,780.64/19.37
6. Step 6: Final answer
   x = 91.92