Finding the Fourth Proportional to 92.72, 139.08 and 28.59

Step by Step Solution

1. Step 1: Write the proportion equation
   92.72 : 139.08 = 28.59 : x
2. Step 2: Convert to fraction form
   92.72/139.08 = 28.59/x
3. Step 3: Cross multiply
   92.72x = 139.08 × 28.59
4. Step 4: Simplify right side
   92.72x = 3,976.82
5. Step 5: Solve for x
   x = 3,976.82/92.72
6. Step 6: Final answer
   x = 42.89