Finding the Fourth Proportional to 78.79, 108.17 and 67.87

Step by Step Solution

1. Step 1: Write the proportion equation
   78.79 : 108.17 = 67.87 : x
2. Step 2: Convert to fraction form
   78.79/108.17 = 67.87/x
3. Step 3: Cross multiply
   78.79x = 108.17 × 67.87
4. Step 4: Simplify right side
   78.79x = 7,341.50
5. Step 5: Solve for x
   x = 7,341.50/78.79
6. Step 6: Final answer
   x = 93.18