Finding the Fourth Proportional to 2,107.82, 2,908.50 and 1,223.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,107.82 : 2,908.50 = 1,223.30 : x
2. Step 2: Convert to fraction form
   2,107.82/2,908.50 = 1,223.30/x
3. Step 3: Cross multiply
   2,107.82x = 2,908.50 × 1,223.30
4. Step 4: Simplify right side
   2,107.82x = 3,557,968.05
5. Step 5: Solve for x
   x = 3,557,968.05/2,107.82
6. Step 6: Final answer
   x = 1,687.98