Finding the Fourth Proportional to 52.74, 78.59 and 50.42

Step by Step Solution

1. Step 1: Write the proportion equation
   52.74 : 78.59 = 50.42 : x
2. Step 2: Convert to fraction form
   52.74/78.59 = 50.42/x
3. Step 3: Cross multiply
   52.74x = 78.59 × 50.42
4. Step 4: Simplify right side
   52.74x = 3,961.86
5. Step 5: Solve for x
   x = 3,961.86/52.74
6. Step 6: Final answer
   x = 75.12