Finding the Fourth Proportional to 89.63, 134.36 and 78.83

Step by Step Solution

1. Step 1: Write the proportion equation
   89.63 : 134.36 = 78.83 : x
2. Step 2: Convert to fraction form
   89.63/134.36 = 78.83/x
3. Step 3: Cross multiply
   89.63x = 134.36 × 78.83
4. Step 4: Simplify right side
   89.63x = 10,591.20
5. Step 5: Solve for x
   x = 10,591.20/89.63
6. Step 6: Final answer
   x = 118.17