Finding the Fourth Proportional to 5,256.47, 7,890.17 and 3,871.37

Step by Step Solution

1. Step 1: Write the proportion equation
   5,256.47 : 7,890.17 = 3,871.37 : x
2. Step 2: Convert to fraction form
   5,256.47/7,890.17 = 3,871.37/x
3. Step 3: Cross multiply
   5,256.47x = 7,890.17 × 3,871.37
4. Step 4: Simplify right side
   5,256.47x = 30,545,708.63
5. Step 5: Solve for x
   x = 30,545,708.63/5,256.47
6. Step 6: Final answer
   x = 5,811.07