Finding the Fourth Proportional to 76.72, 105.92 and 52.12

Step by Step Solution

1. Step 1: Write the proportion equation
   76.72 : 105.92 = 52.12 : x
2. Step 2: Convert to fraction form
   76.72/105.92 = 52.12/x
3. Step 3: Cross multiply
   76.72x = 105.92 × 52.12
4. Step 4: Simplify right side
   76.72x = 5,520.55
5. Step 5: Solve for x
   x = 5,520.55/76.72
6. Step 6: Final answer
   x = 71.96