Finding the Fourth Proportional to 3,874.27, 5,807.76 and 2,139.25

Step by Step Solution

1. Step 1: Write the proportion equation
   3,874.27 : 5,807.76 = 2,139.25 : x
2. Step 2: Convert to fraction form
   3,874.27/5,807.76 = 2,139.25/x
3. Step 3: Cross multiply
   3,874.27x = 5,807.76 × 2,139.25
4. Step 4: Simplify right side
   3,874.27x = 12,424,250.58
5. Step 5: Solve for x
   x = 12,424,250.58/3,874.27
6. Step 6: Final answer
   x = 3,206.86