Finding the Fourth Proportional to 13,868.63, 20,802.89 and 3,480.38

Step by Step Solution

1. Step 1: Write the proportion equation
   13,868.63 : 20,802.89 = 3,480.38 : x
2. Step 2: Convert to fraction form
   13,868.63/20,802.89 = 3,480.38/x
3. Step 3: Cross multiply
   13,868.63x = 20,802.89 × 3,480.38
4. Step 4: Simplify right side
   13,868.63x = 72,401,945.00
5. Step 5: Solve for x
   x = 72,401,945.00/13,868.63
6. Step 6: Final answer
   x = 5,220.56