Finding the Fourth Proportional to 89.35, 133.94 and 81.83

Step by Step Solution

1. Step 1: Write the proportion equation
   89.35 : 133.94 = 81.83 : x
2. Step 2: Convert to fraction form
   89.35/133.94 = 81.83/x
3. Step 3: Cross multiply
   89.35x = 133.94 × 81.83
4. Step 4: Simplify right side
   89.35x = 10,960.31
5. Step 5: Solve for x
   x = 10,960.31/89.35
6. Step 6: Final answer
   x = 122.67