Finding the Fourth Proportional to 7,728.72, 10,662.84 and 5,077.56

Step by Step Solution

1. Step 1: Write the proportion equation
   7,728.72 : 10,662.84 = 5,077.56 : x
2. Step 2: Convert to fraction form
   7,728.72/10,662.84 = 5,077.56/x
3. Step 3: Cross multiply
   7,728.72x = 10,662.84 × 5,077.56
4. Step 4: Simplify right side
   7,728.72x = 54,141,209.87
5. Step 5: Solve for x
   x = 54,141,209.87/7,728.72
6. Step 6: Final answer
   x = 7,005.20