Finding the Fourth Proportional to 13,699.50, 20,549.59 and 3,839.55

Step by Step Solution

1. Step 1: Write the proportion equation
   13,699.50 : 20,549.59 = 3,839.55 : x
2. Step 2: Convert to fraction form
   13,699.50/20,549.59 = 3,839.55/x
3. Step 3: Cross multiply
   13,699.50x = 20,549.59 × 3,839.55
4. Step 4: Simplify right side
   13,699.50x = 78,901,091.62
5. Step 5: Solve for x
   x = 78,901,091.62/13,699.50
6. Step 6: Final answer
   x = 5,759.42