Finding the Fourth Proportional to 100.71, 151.06 and 28.56

Step by Step Solution

1. Step 1: Write the proportion equation
   100.71 : 151.06 = 28.56 : x
2. Step 2: Convert to fraction form
   100.71/151.06 = 28.56/x
3. Step 3: Cross multiply
   100.71x = 151.06 × 28.56
4. Step 4: Simplify right side
   100.71x = 4,314.27
5. Step 5: Solve for x
   x = 4,314.27/100.71
6. Step 6: Final answer
   x = 42.84