Finding the Fourth Proportional to 109.22, 150.59 and 81.50

Step by Step Solution

1. Step 1: Write the proportion equation
   109.22 : 150.59 = 81.50 : x
2. Step 2: Convert to fraction form
   109.22/150.59 = 81.50/x
3. Step 3: Cross multiply
   109.22x = 150.59 × 81.50
4. Step 4: Simplify right side
   109.22x = 12,272.54
5. Step 5: Solve for x
   x = 12,272.54/109.22
6. Step 6: Final answer
   x = 112.37