Finding the Fourth Proportional to 115.83, 159.82 and 78.98

Step by Step Solution

1. Step 1: Write the proportion equation
   115.83 : 159.82 = 78.98 : x
2. Step 2: Convert to fraction form
   115.83/159.82 = 78.98/x
3. Step 3: Cross multiply
   115.83x = 159.82 × 78.98
4. Step 4: Simplify right side
   115.83x = 12,622.03
5. Step 5: Solve for x
   x = 12,622.03/115.83
6. Step 6: Final answer
   x = 108.97