Finding the Fourth Proportional to 100.72, 150.86 and 64.47

Step by Step Solution

1. Step 1: Write the proportion equation
   100.72 : 150.86 = 64.47 : x
2. Step 2: Convert to fraction form
   100.72/150.86 = 64.47/x
3. Step 3: Cross multiply
   100.72x = 150.86 × 64.47
4. Step 4: Simplify right side
   100.72x = 9,725.94
5. Step 5: Solve for x
   x = 9,725.94/100.72
6. Step 6: Final answer
   x = 96.56