Finding the Fourth Proportional to 100.56, 150.72 and 64.56

Step by Step Solution

1. Step 1: Write the proportion equation
   100.56 : 150.72 = 64.56 : x
2. Step 2: Convert to fraction form
   100.56/150.72 = 64.56/x
3. Step 3: Cross multiply
   100.56x = 150.72 × 64.56
4. Step 4: Simplify right side
   100.56x = 9,730.48
5. Step 5: Solve for x
   x = 9,730.48/100.56
6. Step 6: Final answer
   x = 96.76