Finding the Fourth Proportional to 90.27, 124.59 and 57.54

Step by Step Solution

1. Step 1: Write the proportion equation
   90.27 : 124.59 = 57.54 : x
2. Step 2: Convert to fraction form
   90.27/124.59 = 57.54/x
3. Step 3: Cross multiply
   90.27x = 124.59 × 57.54
4. Step 4: Simplify right side
   90.27x = 7,168.91
5. Step 5: Solve for x
   x = 7,168.91/90.27
6. Step 6: Final answer
   x = 79.42