Finding the Fourth Proportional to 100.72, 150.35 and 80.25

Step by Step Solution

1. Step 1: Write the proportion equation
   100.72 : 150.35 = 80.25 : x
2. Step 2: Convert to fraction form
   100.72/150.35 = 80.25/x
3. Step 3: Cross multiply
   100.72x = 150.35 × 80.25
4. Step 4: Simplify right side
   100.72x = 12,065.59
5. Step 5: Solve for x
   x = 12,065.59/100.72
6. Step 6: Final answer
   x = 119.79