Finding the Third Proportional to 42.28 and 91.31

Step by Step Solution

1. Step 1: Write the proportion equation
   42.28 : 91.31 = 91.31 : x
2. Step 2: Convert to fraction form
   42.28/91.31 = 91.31/x
3. Step 3: Cross multiply
   42.28x = 91.31 × 91.31
4. Step 4: Simplify right side
   42.28x = 8,337.97
5. Step 5: Solve for x
   x = 8,337.97/42.28
6. Step 6: Final answer
   x = 197.20