Finding the Fourth Proportional to 76.72, 105.90 and 50.52

Step by Step Solution

1. Step 1: Write the proportion equation
   76.72 : 105.90 = 50.52 : x
2. Step 2: Convert to fraction form
   76.72/105.90 = 50.52/x
3. Step 3: Cross multiply
   76.72x = 105.90 × 50.52
4. Step 4: Simplify right side
   76.72x = 5,350.07
5. Step 5: Solve for x
   x = 5,350.07/76.72
6. Step 6: Final answer
   x = 69.73