Finding the Fourth Proportional to 7,008.72, 9,664.88 and 5,120.56

Step by Step Solution

1. Step 1: Write the proportion equation
   7,008.72 : 9,664.88 = 5,120.56 : x
2. Step 2: Convert to fraction form
   7,008.72/9,664.88 = 5,120.56/x
3. Step 3: Cross multiply
   7,008.72x = 9,664.88 × 5,120.56
4. Step 4: Simplify right side
   7,008.72x = 49,489,597.93
5. Step 5: Solve for x
   x = 49,489,597.93/7,008.72
6. Step 6: Final answer
   x = 7,061.15