Finding the Fourth Proportional to 78.81, 118.17 and 33.18

Step by Step Solution

1. Step 1: Write the proportion equation
   78.81 : 118.17 = 33.18 : x
2. Step 2: Convert to fraction form
   78.81/118.17 = 33.18/x
3. Step 3: Cross multiply
   78.81x = 118.17 × 33.18
4. Step 4: Simplify right side
   78.81x = 3,920.88
5. Step 5: Solve for x
   x = 3,920.88/78.81
6. Step 6: Final answer
   x = 49.75