Finding the Fourth Proportional to 90.18, 124.52 and 87.27

Step by Step Solution

1. Step 1: Write the proportion equation
   90.18 : 124.52 = 87.27 : x
2. Step 2: Convert to fraction form
   90.18/124.52 = 87.27/x
3. Step 3: Cross multiply
   90.18x = 124.52 × 87.27
4. Step 4: Simplify right side
   90.18x = 10,866.42
5. Step 5: Solve for x
   x = 10,866.42/90.18
6. Step 6: Final answer
   x = 120.50