Finding the Fourth Proportional to 109.82, 151.61 and 99.42

Step by Step Solution

1. Step 1: Write the proportion equation
   109.82 : 151.61 = 99.42 : x
2. Step 2: Convert to fraction form
   109.82/151.61 = 99.42/x
3. Step 3: Cross multiply
   109.82x = 151.61 × 99.42
4. Step 4: Simplify right side
   109.82x = 15,072.57
5. Step 5: Solve for x
   x = 15,072.57/109.82
6. Step 6: Final answer
   x = 137.25