Finding the Fourth Proportional to 3.94, 5.89 and 3.18

Step by Step Solution

1. Step 1: Write the proportion equation
   3.94 : 5.89 = 3.18 : x
2. Step 2: Convert to fraction form
   3.94/5.89 = 3.18/x
3. Step 3: Cross multiply
   3.94x = 5.89 × 3.18
4. Step 4: Simplify right side
   3.94x = 18.73
5. Step 5: Solve for x
   x = 18.73/3.94
6. Step 6: Final answer
   x = 4.75