Finding the Fourth Proportional to 127.72, 191.28 and 100.18

Step by Step Solution

1. Step 1: Write the proportion equation
   127.72 : 191.28 = 100.18 : x
2. Step 2: Convert to fraction form
   127.72/191.28 = 100.18/x
3. Step 3: Cross multiply
   127.72x = 191.28 × 100.18
4. Step 4: Simplify right side
   127.72x = 19,162.43
5. Step 5: Solve for x
   x = 19,162.43/127.72
6. Step 6: Final answer
   x = 150.03