Finding the Fourth Proportional to 90.27, 124.52 and 57.50

Step by Step Solution

1. Step 1: Write the proportion equation
   90.27 : 124.52 = 57.50 : x
2. Step 2: Convert to fraction form
   90.27/124.52 = 57.50/x
3. Step 3: Cross multiply
   90.27x = 124.52 × 57.50
4. Step 4: Simplify right side
   90.27x = 7,159.42
5. Step 5: Solve for x
   x = 7,159.42/90.27
6. Step 6: Final answer
   x = 79.31