Finding the Fourth Proportional to 109.18, 150.72 and 70.42

Step by Step Solution

1. Step 1: Write the proportion equation
   109.18 : 150.72 = 70.42 : x
2. Step 2: Convert to fraction form
   109.18/150.72 = 70.42/x
3. Step 3: Cross multiply
   109.18x = 150.72 × 70.42
4. Step 4: Simplify right side
   109.18x = 10,613.70
5. Step 5: Solve for x
   x = 10,613.70/109.18
6. Step 6: Final answer
   x = 97.21