Finding the Fourth Proportional to 151.90, 227.31 and 142.69

Step by Step Solution

1. Step 1: Write the proportion equation
   151.90 : 227.31 = 142.69 : x
2. Step 2: Convert to fraction form
   151.90/227.31 = 142.69/x
3. Step 3: Cross multiply
   151.90x = 227.31 × 142.69
4. Step 4: Simplify right side
   151.90x = 32,434.86
5. Step 5: Solve for x
   x = 32,434.86/151.90
6. Step 6: Final answer
   x = 213.53