Finding the Fourth Proportional to 151.49, 227.32 and 139.88

Step by Step Solution

1. Step 1: Write the proportion equation
   151.49 : 227.32 = 139.88 : x
2. Step 2: Convert to fraction form
   151.49/227.32 = 139.88/x
3. Step 3: Cross multiply
   151.49x = 227.32 × 139.88
4. Step 4: Simplify right side
   151.49x = 31,795.69
5. Step 5: Solve for x
   x = 31,795.69/151.49
6. Step 6: Final answer
   x = 209.89