Finding the Fourth Proportional to 2,105.82, 2,906.08 and 1,209.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.82 : 2,906.08 = 1,209.71 : x
2. Step 2: Convert to fraction form
   2,105.82/2,906.08 = 1,209.71/x
3. Step 3: Cross multiply
   2,105.82x = 2,906.08 × 1,209.71
4. Step 4: Simplify right side
   2,105.82x = 3,515,518.28
5. Step 5: Solve for x
   x = 3,515,518.28/2,105.82
6. Step 6: Final answer
   x = 1,669.43