Finding the Fourth Proportional to 13,814.37, 20,721.52 and 3,426.12

Step by Step Solution

1. Step 1: Write the proportion equation
   13,814.37 : 20,721.52 = 3,426.12 : x
2. Step 2: Convert to fraction form
   13,814.37/20,721.52 = 3,426.12/x
3. Step 3: Cross multiply
   13,814.37x = 20,721.52 × 3,426.12
4. Step 4: Simplify right side
   13,814.37x = 70,994,414.10
5. Step 5: Solve for x
   x = 70,994,414.10/13,814.37
6. Step 6: Final answer
   x = 5,139.17