Finding the Fourth Proportional to 151.88, 209.59 and 86.42

Step by Step Solution

1. Step 1: Write the proportion equation
   151.88 : 209.59 = 86.42 : x
2. Step 2: Convert to fraction form
   151.88/209.59 = 86.42/x
3. Step 3: Cross multiply
   151.88x = 209.59 × 86.42
4. Step 4: Simplify right side
   151.88x = 18,111.90
5. Step 5: Solve for x
   x = 18,111.90/151.88
6. Step 6: Final answer
   x = 119.26