Finding the Fourth Proportional to 89.48, 134.34 and 57.12

Step by Step Solution

1. Step 1: Write the proportion equation
   89.48 : 134.34 = 57.12 : x
2. Step 2: Convert to fraction form
   89.48/134.34 = 57.12/x
3. Step 3: Cross multiply
   89.48x = 134.34 × 57.12
4. Step 4: Simplify right side
   89.48x = 7,673.50
5. Step 5: Solve for x
   x = 7,673.50/89.48
6. Step 6: Final answer
   x = 85.76