Finding the Fourth Proportional to 78.77, 118.18 and 33.12

Step by Step Solution

1. Step 1: Write the proportion equation
   78.77 : 118.18 = 33.12 : x
2. Step 2: Convert to fraction form
   78.77/118.18 = 33.12/x
3. Step 3: Cross multiply
   78.77x = 118.18 × 33.12
4. Step 4: Simplify right side
   78.77x = 3,914.04
5. Step 5: Solve for x
   x = 3,914.04/78.77
6. Step 6: Final answer
   x = 49.69