Finding the Fourth Proportional to 72.57, 109.27 and 52.42

Step by Step Solution

1. Step 1: Write the proportion equation
   72.57 : 109.27 = 52.42 : x
2. Step 2: Convert to fraction form
   72.57/109.27 = 52.42/x
3. Step 3: Cross multiply
   72.57x = 109.27 × 52.42
4. Step 4: Simplify right side
   72.57x = 5,727.93
5. Step 5: Solve for x
   x = 5,727.93/72.57
6. Step 6: Final answer
   x = 78.93