Finding the Fourth Proportional to 89.69, 134.49 and 55.35

Step by Step Solution

1. Step 1: Write the proportion equation
   89.69 : 134.49 = 55.35 : x
2. Step 2: Convert to fraction form
   89.69/134.49 = 55.35/x
3. Step 3: Cross multiply
   89.69x = 134.49 × 55.35
4. Step 4: Simplify right side
   89.69x = 7,443.72
5. Step 5: Solve for x
   x = 7,443.72/89.69
6. Step 6: Final answer
   x = 83.00