Finding the Fourth Proportional to 88.94, 133.42 and 78.78

Step by Step Solution

1. Step 1: Write the proportion equation
   88.94 : 133.42 = 78.78 : x
2. Step 2: Convert to fraction form
   88.94/133.42 = 78.78/x
3. Step 3: Cross multiply
   88.94x = 133.42 × 78.78
4. Step 4: Simplify right side
   88.94x = 10,510.83
5. Step 5: Solve for x
   x = 10,510.83/88.94
6. Step 6: Final answer
   x = 118.18