Finding the Third Proportional to 18.40 and 42.29

Step by Step Solution

1. Step 1: Write the proportion equation
   18.40 : 42.29 = 42.29 : x
2. Step 2: Convert to fraction form
   18.40/42.29 = 42.29/x
3. Step 3: Cross multiply
   18.40x = 42.29 × 42.29
4. Step 4: Simplify right side
   18.40x = 1,788.70
5. Step 5: Solve for x
   x = 1,788.70/18.40
6. Step 6: Final answer
   x = 97.19