Finding the Fourth Proportional to 71.31, 107.01 and 28.56

Step by Step Solution

1. Step 1: Write the proportion equation
   71.31 : 107.01 = 28.56 : x
2. Step 2: Convert to fraction form
   71.31/107.01 = 28.56/x
3. Step 3: Cross multiply
   71.31x = 107.01 × 28.56
4. Step 4: Simplify right side
   71.31x = 3,056.21
5. Step 5: Solve for x
   x = 3,056.21/71.31
6. Step 6: Final answer
   x = 42.86