Finding the Fourth Proportional to 109.02, 150.52 and 81.42

Step by Step Solution

1. Step 1: Write the proportion equation
   109.02 : 150.52 = 81.42 : x
2. Step 2: Convert to fraction form
   109.02/150.52 = 81.42/x
3. Step 3: Cross multiply
   109.02x = 150.52 × 81.42
4. Step 4: Simplify right side
   109.02x = 12,255.34
5. Step 5: Solve for x
   x = 12,255.34/109.02
6. Step 6: Final answer
   x = 112.41