Finding the Fourth Proportional to 2,626.16, 3,939.28 and 2,103.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,626.16 : 3,939.28 = 2,103.72 : x
2. Step 2: Convert to fraction form
   2,626.16/3,939.28 = 2,103.72/x
3. Step 3: Cross multiply
   2,626.16x = 3,939.28 × 2,103.72
4. Step 4: Simplify right side
   2,626.16x = 8,287,142.12
5. Step 5: Solve for x
   x = 8,287,142.12/2,626.16
6. Step 6: Final answer
   x = 3,155.61