Finding the Fourth Proportional to 100.72, 150.76 and 71.56

Step by Step Solution

1. Step 1: Write the proportion equation
   100.72 : 150.76 = 71.56 : x
2. Step 2: Convert to fraction form
   100.72/150.76 = 71.56/x
3. Step 3: Cross multiply
   100.72x = 150.76 × 71.56
4. Step 4: Simplify right side
   100.72x = 10,788.39
5. Step 5: Solve for x
   x = 10,788.39/100.72
6. Step 6: Final answer
   x = 107.11