Finding the Fourth Proportional to 151.40, 208.71 and 111.98

Step by Step Solution

1. Step 1: Write the proportion equation
   151.40 : 208.71 = 111.98 : x
2. Step 2: Convert to fraction form
   151.40/208.71 = 111.98/x
3. Step 3: Cross multiply
   151.40x = 208.71 × 111.98
4. Step 4: Simplify right side
   151.40x = 23,370.30
5. Step 5: Solve for x
   x = 23,370.30/151.40
6. Step 6: Final answer
   x = 154.37