Finding the Fourth Proportional to 89.82, 134.49 and 77.94

Step by Step Solution

1. Step 1: Write the proportion equation
   89.82 : 134.49 = 77.94 : x
2. Step 2: Convert to fraction form
   89.82/134.49 = 77.94/x
3. Step 3: Cross multiply
   89.82x = 134.49 × 77.94
4. Step 4: Simplify right side
   89.82x = 10,482.15
5. Step 5: Solve for x
   x = 10,482.15/89.82
6. Step 6: Final answer
   x = 116.70