Finding the Fourth Proportional to 78.98, 118.42 and 33.31

Step by Step Solution

1. Step 1: Write the proportion equation
   78.98 : 118.42 = 33.31 : x
2. Step 2: Convert to fraction form
   78.98/118.42 = 33.31/x
3. Step 3: Cross multiply
   78.98x = 118.42 × 33.31
4. Step 4: Simplify right side
   78.98x = 3,944.87
5. Step 5: Solve for x
   x = 3,944.87/78.98
6. Step 6: Final answer
   x = 49.95