Finding the Fourth Proportional to 7,731.68, 10,662.72 and 5,078.16

Step by Step Solution

1. Step 1: Write the proportion equation
   7,731.68 : 10,662.72 = 5,078.16 : x
2. Step 2: Convert to fraction form
   7,731.68/10,662.72 = 5,078.16/x
3. Step 3: Cross multiply
   7,731.68x = 10,662.72 × 5,078.16
4. Step 4: Simplify right side
   7,731.68x = 54,146,998.20
5. Step 5: Solve for x
   x = 54,146,998.20/7,731.68
6. Step 6: Final answer
   x = 7,003.26