Finding the Fourth Proportional to 5,141.43, 7,712.69 and 1,679.31

Step by Step Solution

1. Step 1: Write the proportion equation
   5,141.43 : 7,712.69 = 1,679.31 : x
2. Step 2: Convert to fraction form
   5,141.43/7,712.69 = 1,679.31/x
3. Step 3: Cross multiply
   5,141.43x = 7,712.69 × 1,679.31
4. Step 4: Simplify right side
   5,141.43x = 12,951,989.05
5. Step 5: Solve for x
   x = 12,951,989.05/5,141.43
6. Step 6: Final answer
   x = 2,519.14