Finding the Fourth Proportional to 5,173.69, 7,139.82 and 2,815.96

Step by Step Solution

1. Step 1: Write the proportion equation
   5,173.69 : 7,139.82 = 2,815.96 : x
2. Step 2: Convert to fraction form
   5,173.69/7,139.82 = 2,815.96/x
3. Step 3: Cross multiply
   5,173.69x = 7,139.82 × 2,815.96
4. Step 4: Simplify right side
   5,173.69x = 20,105,447.53
5. Step 5: Solve for x
   x = 20,105,447.53/5,173.69
6. Step 6: Final answer
   x = 3,886.09