Finding the Fourth Proportional to 89.58, 134.16 and 57.42

Step by Step Solution

1. Step 1: Write the proportion equation
   89.58 : 134.16 = 57.42 : x
2. Step 2: Convert to fraction form
   89.58/134.16 = 57.42/x
3. Step 3: Cross multiply
   89.58x = 134.16 × 57.42
4. Step 4: Simplify right side
   89.58x = 7,703.47
5. Step 5: Solve for x
   x = 7,703.47/89.58
6. Step 6: Final answer
   x = 86.00