Finding the Fourth Proportional to 67.91, 102.23 and 52.79

Step by Step Solution

1. Step 1: Write the proportion equation
   67.91 : 102.23 = 52.79 : x
2. Step 2: Convert to fraction form
   67.91/102.23 = 52.79/x
3. Step 3: Cross multiply
   67.91x = 102.23 × 52.79
4. Step 4: Simplify right side
   67.91x = 5,396.72
5. Step 5: Solve for x
   x = 5,396.72/67.91
6. Step 6: Final answer
   x = 79.47