Finding the Fourth Proportional to 89.55, 134.15 and 57.42

Step by Step Solution

1. Step 1: Write the proportion equation
   89.55 : 134.15 = 57.42 : x
2. Step 2: Convert to fraction form
   89.55/134.15 = 57.42/x
3. Step 3: Cross multiply
   89.55x = 134.15 × 57.42
4. Step 4: Simplify right side
   89.55x = 7,702.61
5. Step 5: Solve for x
   x = 7,702.61/89.55
6. Step 6: Final answer
   x = 86.01