Finding the Fourth Proportional to 3,727.86, 5,139.38 and 2,815.38

Step by Step Solution

1. Step 1: Write the proportion equation
   3,727.86 : 5,139.38 = 2,815.38 : x
2. Step 2: Convert to fraction form
   3,727.86/5,139.38 = 2,815.38/x
3. Step 3: Cross multiply
   3,727.86x = 5,139.38 × 2,815.38
4. Step 4: Simplify right side
   3,727.86x = 14,469,293.59
5. Step 5: Solve for x
   x = 14,469,293.59/3,727.86
6. Step 6: Final answer
   x = 3,881.39