Finding the Fourth Proportional to 4,139.70, 5,713.38 and 3,143.34

Step by Step Solution

1. Step 1: Write the proportion equation
   4,139.70 : 5,713.38 = 3,143.34 : x
2. Step 2: Convert to fraction form
   4,139.70/5,713.38 = 3,143.34/x
3. Step 3: Cross multiply
   4,139.70x = 5,713.38 × 3,143.34
4. Step 4: Simplify right side
   4,139.70x = 17,959,095.89
5. Step 5: Solve for x
   x = 17,959,095.89/4,139.70
6. Step 6: Final answer
   x = 4,338.26