Finding the Fourth Proportional to 79.78, 119.69 and 43.73

Step by Step Solution

1. Step 1: Write the proportion equation
   79.78 : 119.69 = 43.73 : x
2. Step 2: Convert to fraction form
   79.78/119.69 = 43.73/x
3. Step 3: Cross multiply
   79.78x = 119.69 × 43.73
4. Step 4: Simplify right side
   79.78x = 5,233.83
5. Step 5: Solve for x
   x = 5,233.83/79.78
6. Step 6: Final answer
   x = 65.61