Finding the Fourth Proportional to 76.42, 105.52 and 50.21

Step by Step Solution

1. Step 1: Write the proportion equation
   76.42 : 105.52 = 50.21 : x
2. Step 2: Convert to fraction form
   76.42/105.52 = 50.21/x
3. Step 3: Cross multiply
   76.42x = 105.52 × 50.21
4. Step 4: Simplify right side
   76.42x = 5,298.30
5. Step 5: Solve for x
   x = 5,298.30/76.42
6. Step 6: Final answer
   x = 69.33