Finding the Fourth Proportional to 100.68, 150.72 and 71.76

Step by Step Solution

1. Step 1: Write the proportion equation
   100.68 : 150.72 = 71.76 : x
2. Step 2: Convert to fraction form
   100.68/150.72 = 71.76/x
3. Step 3: Cross multiply
   100.68x = 150.72 × 71.76
4. Step 4: Simplify right side
   100.68x = 10,815.67
5. Step 5: Solve for x
   x = 10,815.67/100.68
6. Step 6: Final answer
   x = 107.43