Finding the Fourth Proportional to 3,684.20, 5,553.89 and 3,439.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,684.20 : 5,553.89 = 3,439.76 : x
2. Step 2: Convert to fraction form
   3,684.20/5,553.89 = 3,439.76/x
3. Step 3: Cross multiply
   3,684.20x = 5,553.89 × 3,439.76
4. Step 4: Simplify right side
   3,684.20x = 19,104,048.67
5. Step 5: Solve for x
   x = 19,104,048.67/3,684.20
6. Step 6: Final answer
   x = 5,185.40