Finding the Fourth Proportional to 151.31, 208.81 and 82.31

Step by Step Solution

1. Step 1: Write the proportion equation
   151.31 : 208.81 = 82.31 : x
2. Step 2: Convert to fraction form
   151.31/208.81 = 82.31/x
3. Step 3: Cross multiply
   151.31x = 208.81 × 82.31
4. Step 4: Simplify right side
   151.31x = 17,187.78
5. Step 5: Solve for x
   x = 17,187.78/151.31
6. Step 6: Final answer
   x = 113.59