Finding the Fourth Proportional to 13,438.83, 20,162.33 and 5,429.49

Step by Step Solution

1. Step 1: Write the proportion equation
   13,438.83 : 20,162.33 = 5,429.49 : x
2. Step 2: Convert to fraction form
   13,438.83/20,162.33 = 5,429.49/x
3. Step 3: Cross multiply
   13,438.83x = 20,162.33 × 5,429.49
4. Step 4: Simplify right side
   13,438.83x = 109,471,141.96
5. Step 5: Solve for x
   x = 109,471,141.96/13,438.83
6. Step 6: Final answer
   x = 8,145.88