Finding the Fourth Proportional to 76.72, 105.88 and 50.51

Step by Step Solution

1. Step 1: Write the proportion equation
   76.72 : 105.88 = 50.51 : x
2. Step 2: Convert to fraction form
   76.72/105.88 = 50.51/x
3. Step 3: Cross multiply
   76.72x = 105.88 × 50.51
4. Step 4: Simplify right side
   76.72x = 5,348.00
5. Step 5: Solve for x
   x = 5,348.00/76.72
6. Step 6: Final answer
   x = 69.71