Finding the Fourth Proportional to 51.61, 71.25 and 42.43

Step by Step Solution

1. Step 1: Write the proportion equation
   51.61 : 71.25 = 42.43 : x
2. Step 2: Convert to fraction form
   51.61/71.25 = 42.43/x
3. Step 3: Cross multiply
   51.61x = 71.25 × 42.43
4. Step 4: Simplify right side
   51.61x = 3,022.78
5. Step 5: Solve for x
   x = 3,022.78/51.61
6. Step 6: Final answer
   x = 58.58