Finding the Fourth Proportional to 42.80, 60.42 and 42.80

Step by Step Solution

1. Step 1: Write the proportion equation
   42.80 : 60.42 = 42.80 : x
2. Step 2: Convert to fraction form
   42.80/60.42 = 42.80/x
3. Step 3: Cross multiply
   42.80x = 60.42 × 42.80
4. Step 4: Simplify right side
   42.80x = 2,585.98
5. Step 5: Solve for x
   x = 2,585.98/42.80
6. Step 6: Final answer
   x = 60.42