Finding the Fourth Proportional to 7,721.20, 10,650.72 and 5,068.72

Step by Step Solution

1. Step 1: Write the proportion equation
   7,721.20 : 10,650.72 = 5,068.72 : x
2. Step 2: Convert to fraction form
   7,721.20/10,650.72 = 5,068.72/x
3. Step 3: Cross multiply
   7,721.20x = 10,650.72 × 5,068.72
4. Step 4: Simplify right side
   7,721.20x = 53,985,517.48
5. Step 5: Solve for x
   x = 53,985,517.48/7,721.20
6. Step 6: Final answer
   x = 6,991.86