Finding the Fourth Proportional to 78.91, 108.79 and 67.82

Step by Step Solution

1. Step 1: Write the proportion equation
   78.91 : 108.79 = 67.82 : x
2. Step 2: Convert to fraction form
   78.91/108.79 = 67.82/x
3. Step 3: Cross multiply
   78.91x = 108.79 × 67.82
4. Step 4: Simplify right side
   78.91x = 7,378.14
5. Step 5: Solve for x
   x = 7,378.14/78.91
6. Step 6: Final answer
   x = 93.50