Finding the Fourth Proportional to 2,107.83, 2,908.29 and 1,311.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,107.83 : 2,908.29 = 1,311.78 : x
2. Step 2: Convert to fraction form
   2,107.83/2,908.29 = 1,311.78/x
3. Step 3: Cross multiply
   2,107.83x = 2,908.29 × 1,311.78
4. Step 4: Simplify right side
   2,107.83x = 3,815,036.66
5. Step 5: Solve for x
   x = 3,815,036.66/2,107.83
6. Step 6: Final answer
   x = 1,809.94