Finding the Fourth Proportional to 78.88, 108.83 and 47.79

Step by Step Solution

1. Step 1: Write the proportion equation
   78.88 : 108.83 = 47.79 : x
2. Step 2: Convert to fraction form
   78.88/108.83 = 47.79/x
3. Step 3: Cross multiply
   78.88x = 108.83 × 47.79
4. Step 4: Simplify right side
   78.88x = 5,200.59
5. Step 5: Solve for x
   x = 5,200.59/78.88
6. Step 6: Final answer
   x = 65.93