Finding the Fourth Proportional to 100.72, 150.73 and 80.22

Step by Step Solution

1. Step 1: Write the proportion equation
   100.72 : 150.73 = 80.22 : x
2. Step 2: Convert to fraction form
   100.72/150.73 = 80.22/x
3. Step 3: Cross multiply
   100.72x = 150.73 × 80.22
4. Step 4: Simplify right side
   100.72x = 12,091.56
5. Step 5: Solve for x
   x = 12,091.56/100.72
6. Step 6: Final answer
   x = 120.05