Finding the Fourth Proportional to 127.12, 189.69 and 110.72

Step by Step Solution

1. Step 1: Write the proportion equation
   127.12 : 189.69 = 110.72 : x
2. Step 2: Convert to fraction form
   127.12/189.69 = 110.72/x
3. Step 3: Cross multiply
   127.12x = 189.69 × 110.72
4. Step 4: Simplify right side
   127.12x = 21,001.92
5. Step 5: Solve for x
   x = 21,001.92/127.12
6. Step 6: Final answer
   x = 165.21