Finding the Fourth Proportional to 89.56, 134.49 and 79.81

Step by Step Solution

1. Step 1: Write the proportion equation
   89.56 : 134.49 = 79.81 : x
2. Step 2: Convert to fraction form
   89.56/134.49 = 79.81/x
3. Step 3: Cross multiply
   89.56x = 134.49 × 79.81
4. Step 4: Simplify right side
   89.56x = 10,733.31
5. Step 5: Solve for x
   x = 10,733.31/89.56
6. Step 6: Final answer
   x = 119.85