Finding the Fourth Proportional to 51.28, 70.81 and 42.06

Step by Step Solution

1. Step 1: Write the proportion equation
   51.28 : 70.81 = 42.06 : x
2. Step 2: Convert to fraction form
   51.28/70.81 = 42.06/x
3. Step 3: Cross multiply
   51.28x = 70.81 × 42.06
4. Step 4: Simplify right side
   51.28x = 2,978.27
5. Step 5: Solve for x
   x = 2,978.27/51.28
6. Step 6: Final answer
   x = 58.08