Finding the Fourth Proportional to 5,196.91, 7,171.69 and 2,839

Step by Step Solution

1. Step 1: Write the proportion equation
   5,196.91 : 7,171.69 = 2,839 : x
2. Step 2: Convert to fraction form
   5,196.91/7,171.69 = 2,839/x
3. Step 3: Cross multiply
   5,196.91x = 7,171.69 × 2,839
4. Step 4: Simplify right side
   5,196.91x = 20,360,427.91
5. Step 5: Solve for x
   x = 20,360,427.91/5,196.91
6. Step 6: Final answer
   x = 3,917.79