Finding the Fourth Proportional to 13,743.91, 20,613.50 and 3,880.89

Step by Step Solution

1. Step 1: Write the proportion equation
   13,743.91 : 20,613.50 = 3,880.89 : x
2. Step 2: Convert to fraction form
   13,743.91/20,613.50 = 3,880.89/x
3. Step 3: Cross multiply
   13,743.91x = 20,613.50 × 3,880.89
4. Step 4: Simplify right side
   13,743.91x = 79,998,603.54
5. Step 5: Solve for x
   x = 79,998,603.54/13,743.91
6. Step 6: Final answer
   x = 5,820.66