Finding the Fourth Proportional to 151.61, 209.25 and 86.10

Step by Step Solution

1. Step 1: Write the proportion equation
   151.61 : 209.25 = 86.10 : x
2. Step 2: Convert to fraction form
   151.61/209.25 = 86.10/x
3. Step 3: Cross multiply
   151.61x = 209.25 × 86.10
4. Step 4: Simplify right side
   151.61x = 18,016.43
5. Step 5: Solve for x
   x = 18,016.43/151.61
6. Step 6: Final answer
   x = 118.83