Finding the Fourth Proportional to 78.88, 108.74 and 67.76

Step by Step Solution

1. Step 1: Write the proportion equation
   78.88 : 108.74 = 67.76 : x
2. Step 2: Convert to fraction form
   78.88/108.74 = 67.76/x
3. Step 3: Cross multiply
   78.88x = 108.74 × 67.76
4. Step 4: Simplify right side
   78.88x = 7,367.88
5. Step 5: Solve for x
   x = 7,367.88/78.88
6. Step 6: Final answer
   x = 93.41