Finding the Fourth Proportional to 2,626.70, 3,930.32 and 2,105.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,626.70 : 3,930.32 = 2,105.12 : x
2. Step 2: Convert to fraction form
   2,626.70/3,930.32 = 2,105.12/x
3. Step 3: Cross multiply
   2,626.70x = 3,930.32 × 2,105.12
4. Step 4: Simplify right side
   2,626.70x = 8,273,788.72
5. Step 5: Solve for x
   x = 8,273,788.72/2,626.70
6. Step 6: Final answer
   x = 3,149.88