Finding the Fourth Proportional to 89.43, 134.37 and 79.89

Step by Step Solution

1. Step 1: Write the proportion equation
   89.43 : 134.37 = 79.89 : x
2. Step 2: Convert to fraction form
   89.43/134.37 = 79.89/x
3. Step 3: Cross multiply
   89.43x = 134.37 × 79.89
4. Step 4: Simplify right side
   89.43x = 10,734.82
5. Step 5: Solve for x
   x = 10,734.82/89.43
6. Step 6: Final answer
   x = 120.04