Finding the Fourth Proportional to 109.28, 150.72 and 84.72

Step by Step Solution

1. Step 1: Write the proportion equation
   109.28 : 150.72 = 84.72 : x
2. Step 2: Convert to fraction form
   109.28/150.72 = 84.72/x
3. Step 3: Cross multiply
   109.28x = 150.72 × 84.72
4. Step 4: Simplify right side
   109.28x = 12,769.00
5. Step 5: Solve for x
   x = 12,769.00/109.28
6. Step 6: Final answer
   x = 116.85