Finding the Fourth Proportional to 116.15, 160.24 and 78.79

Step by Step Solution

1. Step 1: Write the proportion equation
   116.15 : 160.24 = 78.79 : x
2. Step 2: Convert to fraction form
   116.15/160.24 = 78.79/x
3. Step 3: Cross multiply
   116.15x = 160.24 × 78.79
4. Step 4: Simplify right side
   116.15x = 12,625.31
5. Step 5: Solve for x
   x = 12,625.31/116.15
6. Step 6: Final answer
   x = 108.70