Finding the Fourth Proportional to 13,826.34, 20,739.59 and 3,438.09

Step by Step Solution

1. Step 1: Write the proportion equation
   13,826.34 : 20,739.59 = 3,438.09 : x
2. Step 2: Convert to fraction form
   13,826.34/20,739.59 = 3,438.09/x
3. Step 3: Cross multiply
   13,826.34x = 20,739.59 × 3,438.09
4. Step 4: Simplify right side
   13,826.34x = 71,304,559.79
5. Step 5: Solve for x
   x = 71,304,559.79/13,826.34
6. Step 6: Final answer
   x = 5,157.15