Finding the Fourth Proportional to 151.50, 227.15 and 90.55

Step by Step Solution

1. Step 1: Write the proportion equation
   151.50 : 227.15 = 90.55 : x
2. Step 2: Convert to fraction form
   151.50/227.15 = 90.55/x
3. Step 3: Cross multiply
   151.50x = 227.15 × 90.55
4. Step 4: Simplify right side
   151.50x = 20,568.43
5. Step 5: Solve for x
   x = 20,568.43/151.50
6. Step 6: Final answer
   x = 135.77