Finding the Fourth Proportional to 2,105.35, 2,905.64 and 1,209.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.35 : 2,905.64 = 1,209.37 : x
2. Step 2: Convert to fraction form
   2,105.35/2,905.64 = 1,209.37/x
3. Step 3: Cross multiply
   2,105.35x = 2,905.64 × 1,209.37
4. Step 4: Simplify right side
   2,105.35x = 3,513,993.85
5. Step 5: Solve for x
   x = 3,513,993.85/2,105.35
6. Step 6: Final answer
   x = 1,669.08