Finding the Fourth Proportional to 2,107.59, 2,908.59 and 1,223.07

Step by Step Solution

1. Step 1: Write the proportion equation
   2,107.59 : 2,908.59 = 1,223.07 : x
2. Step 2: Convert to fraction form
   2,107.59/2,908.59 = 1,223.07/x
3. Step 3: Cross multiply
   2,107.59x = 2,908.59 × 1,223.07
4. Step 4: Simplify right side
   2,107.59x = 3,557,409.17
5. Step 5: Solve for x
   x = 3,557,409.17/2,107.59
6. Step 6: Final answer
   x = 1,687.90