Finding the Fourth Proportional to 51.98, 78.15 and 42.44

Step by Step Solution

1. Step 1: Write the proportion equation
   51.98 : 78.15 = 42.44 : x
2. Step 2: Convert to fraction form
   51.98/78.15 = 42.44/x
3. Step 3: Cross multiply
   51.98x = 78.15 × 42.44
4. Step 4: Simplify right side
   51.98x = 3,316.69
5. Step 5: Solve for x
   x = 3,316.69/51.98
6. Step 6: Final answer
   x = 63.81