Finding the Fourth Proportional to 151.59, 227.15 and 90.69

Step by Step Solution

1. Step 1: Write the proportion equation
   151.59 : 227.15 = 90.69 : x
2. Step 2: Convert to fraction form
   151.59/227.15 = 90.69/x
3. Step 3: Cross multiply
   151.59x = 227.15 × 90.69
4. Step 4: Simplify right side
   151.59x = 20,599.78
5. Step 5: Solve for x
   x = 20,599.78/151.59
6. Step 6: Final answer
   x = 135.89