Finding the Fourth Proportional to 78.56, 108.29 and 68.15

Step by Step Solution

1. Step 1: Write the proportion equation
   78.56 : 108.29 = 68.15 : x
2. Step 2: Convert to fraction form
   78.56/108.29 = 68.15/x
3. Step 3: Cross multiply
   78.56x = 108.29 × 68.15
4. Step 4: Simplify right side
   78.56x = 7,379.96
5. Step 5: Solve for x
   x = 7,379.96/78.56
6. Step 6: Final answer
   x = 93.94