Finding the Fourth Proportional to 89.86, 134.76 and 57.34

Step by Step Solution

1. Step 1: Write the proportion equation
   89.86 : 134.76 = 57.34 : x
2. Step 2: Convert to fraction form
   89.86/134.76 = 57.34/x
3. Step 3: Cross multiply
   89.86x = 134.76 × 57.34
4. Step 4: Simplify right side
   89.86x = 7,727.14
5. Step 5: Solve for x
   x = 7,727.14/89.86
6. Step 6: Final answer
   x = 85.99