Finding the Fourth Proportional to 2,107.59, 2,908.31 and 1,223.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,107.59 : 2,908.31 = 1,223.45 : x
2. Step 2: Convert to fraction form
   2,107.59/2,908.31 = 1,223.45/x
3. Step 3: Cross multiply
   2,107.59x = 2,908.31 × 1,223.45
4. Step 4: Simplify right side
   2,107.59x = 3,558,178.48
5. Step 5: Solve for x
   x = 3,558,178.48/2,107.59
6. Step 6: Final answer
   x = 1,688.27