Finding the Fourth Proportional to 13,689.48, 20,535.25 and 3,828.62

Step by Step Solution

1. Step 1: Write the proportion equation
   13,689.48 : 20,535.25 = 3,828.62 : x
2. Step 2: Convert to fraction form
   13,689.48/20,535.25 = 3,828.62/x
3. Step 3: Cross multiply
   13,689.48x = 20,535.25 × 3,828.62
4. Step 4: Simplify right side
   13,689.48x = 78,621,591.52
5. Step 5: Solve for x
   x = 78,621,591.52/13,689.48
6. Step 6: Final answer
   x = 5,743.21