Finding the Fourth Proportional to 13,871.31, 20,797.25 and 5,105.09

Step by Step Solution

1. Step 1: Write the proportion equation
   13,871.31 : 20,797.25 = 5,105.09 : x
2. Step 2: Convert to fraction form
   13,871.31/20,797.25 = 5,105.09/x
3. Step 3: Cross multiply
   13,871.31x = 20,797.25 × 5,105.09
4. Step 4: Simplify right side
   13,871.31x = 106,171,703.49
5. Step 5: Solve for x
   x = 106,171,703.49/13,871.31
6. Step 6: Final answer
   x = 7,654.05