Finding the Fourth Proportional to 100.72, 150.72 and 71.92

Step by Step Solution

1. Step 1: Write the proportion equation
   100.72 : 150.72 = 71.92 : x
2. Step 2: Convert to fraction form
   100.72/150.72 = 71.92/x
3. Step 3: Cross multiply
   100.72x = 150.72 × 71.92
4. Step 4: Simplify right side
   100.72x = 10,839.78
5. Step 5: Solve for x
   x = 10,839.78/100.72
6. Step 6: Final answer
   x = 107.62