Finding the Fourth Proportional to 71.47, 107.18 and 28.10

Step by Step Solution

1. Step 1: Write the proportion equation
   71.47 : 107.18 = 28.10 : x
2. Step 2: Convert to fraction form
   71.47/107.18 = 28.10/x
3. Step 3: Cross multiply
   71.47x = 107.18 × 28.10
4. Step 4: Simplify right side
   71.47x = 3,011.48
5. Step 5: Solve for x
   x = 3,011.48/71.47
6. Step 6: Final answer
   x = 42.14