Finding the Fourth Proportional to 100.86, 151.32 and 28.72

Step by Step Solution

1. Step 1: Write the proportion equation
   100.86 : 151.32 = 28.72 : x
2. Step 2: Convert to fraction form
   100.86/151.32 = 28.72/x
3. Step 3: Cross multiply
   100.86x = 151.32 × 28.72
4. Step 4: Simplify right side
   100.86x = 4,345.58
5. Step 5: Solve for x
   x = 4,345.58/100.86
6. Step 6: Final answer
   x = 43.09