Finding the Fourth Proportional to 89.55, 134.85 and 78.83

Step by Step Solution

1. Step 1: Write the proportion equation
   89.55 : 134.85 = 78.83 : x
2. Step 2: Convert to fraction form
   89.55/134.85 = 78.83/x
3. Step 3: Cross multiply
   89.55x = 134.85 × 78.83
4. Step 4: Simplify right side
   89.55x = 10,630.15
5. Step 5: Solve for x
   x = 10,630.15/89.55
6. Step 6: Final answer
   x = 118.71