Finding the Fourth Proportional to 3,698.55, 5,103.54 and 2,105.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,698.55 : 5,103.54 = 2,105.40 : x
2. Step 2: Convert to fraction form
   3,698.55/5,103.54 = 2,105.40/x
3. Step 3: Cross multiply
   3,698.55x = 5,103.54 × 2,105.40
4. Step 4: Simplify right side
   3,698.55x = 10,745,012.25
5. Step 5: Solve for x
   x = 10,745,012.25/3,698.55
6. Step 6: Final answer
   x = 2,905.20