Finding the Fourth Proportional to 102.72, 155.28 and 100.32

Step by Step Solution

1. Step 1: Write the proportion equation
   102.72 : 155.28 = 100.32 : x
2. Step 2: Convert to fraction form
   102.72/155.28 = 100.32/x
3. Step 3: Cross multiply
   102.72x = 155.28 × 100.32
4. Step 4: Simplify right side
   102.72x = 15,577.69
5. Step 5: Solve for x
   x = 15,577.69/102.72
6. Step 6: Final answer
   x = 151.65