Finding the Fourth Proportional to 78.72, 117.86 and 44.42

Step by Step Solution

1. Step 1: Write the proportion equation
   78.72 : 117.86 = 44.42 : x
2. Step 2: Convert to fraction form
   78.72/117.86 = 44.42/x
3. Step 3: Cross multiply
   78.72x = 117.86 × 44.42
4. Step 4: Simplify right side
   78.72x = 5,235.52
5. Step 5: Solve for x
   x = 5,235.52/78.72
6. Step 6: Final answer
   x = 66.51