Finding the Fourth Proportional to 69.47, 104.15 and 28.31

Step by Step Solution

1. Step 1: Write the proportion equation
   69.47 : 104.15 = 28.31 : x
2. Step 2: Convert to fraction form
   69.47/104.15 = 28.31/x
3. Step 3: Cross multiply
   69.47x = 104.15 × 28.31
4. Step 4: Simplify right side
   69.47x = 2,947.82
5. Step 5: Solve for x
   x = 2,947.82/69.47
6. Step 6: Final answer
   x = 42.44