Finding the Fourth Proportional to 78.63, 108.27 and 69.42

Step by Step Solution

1. Step 1: Write the proportion equation
   78.63 : 108.27 = 69.42 : x
2. Step 2: Convert to fraction form
   78.63/108.27 = 69.42/x
3. Step 3: Cross multiply
   78.63x = 108.27 × 69.42
4. Step 4: Simplify right side
   78.63x = 7,516.10
5. Step 5: Solve for x
   x = 7,516.10/78.63
6. Step 6: Final answer
   x = 95.59