Finding the Fourth Proportional to 9,139.31, 13,711.73 and 3,871.56

Step by Step Solution

1. Step 1: Write the proportion equation
   9,139.31 : 13,711.73 = 3,871.56 : x
2. Step 2: Convert to fraction form
   9,139.31/13,711.73 = 3,871.56/x
3. Step 3: Cross multiply
   9,139.31x = 13,711.73 × 3,871.56
4. Step 4: Simplify right side
   9,139.31x = 53,085,766.04
5. Step 5: Solve for x
   x = 53,085,766.04/9,139.31
6. Step 6: Final answer
   x = 5,808.51