Finding the Fourth Proportional to 100.87, 151.17 and 64.72

Step by Step Solution

1. Step 1: Write the proportion equation
   100.87 : 151.17 = 64.72 : x
2. Step 2: Convert to fraction form
   100.87/151.17 = 64.72/x
3. Step 3: Cross multiply
   100.87x = 151.17 × 64.72
4. Step 4: Simplify right side
   100.87x = 9,783.72
5. Step 5: Solve for x
   x = 9,783.72/100.87
6. Step 6: Final answer
   x = 96.99