Finding the Fourth Proportional to 151.31, 208.82 and 85.82

Step by Step Solution

1. Step 1: Write the proportion equation
   151.31 : 208.82 = 85.82 : x
2. Step 2: Convert to fraction form
   151.31/208.82 = 85.82/x
3. Step 3: Cross multiply
   151.31x = 208.82 × 85.82
4. Step 4: Simplify right side
   151.31x = 17,920.10
5. Step 5: Solve for x
   x = 17,920.10/151.31
6. Step 6: Final answer
   x = 118.43