Finding the Fourth Proportional to 80.54, 120.89 and 42.05

Step by Step Solution

1. Step 1: Write the proportion equation
   80.54 : 120.89 = 42.05 : x
2. Step 2: Convert to fraction form
   80.54/120.89 = 42.05/x
3. Step 3: Cross multiply
   80.54x = 120.89 × 42.05
4. Step 4: Simplify right side
   80.54x = 5,083.32
5. Step 5: Solve for x
   x = 5,083.32/80.54
6. Step 6: Final answer
   x = 63.11