Finding the Fourth Proportional to 109.98, 151.61 and 86.62

Step by Step Solution

1. Step 1: Write the proportion equation
   109.98 : 151.61 = 86.62 : x
2. Step 2: Convert to fraction form
   109.98/151.61 = 86.62/x
3. Step 3: Cross multiply
   109.98x = 151.61 × 86.62
4. Step 4: Simplify right side
   109.98x = 13,132.46
5. Step 5: Solve for x
   x = 13,132.46/109.98
6. Step 6: Final answer
   x = 119.41