Finding the Fourth Proportional to 2,107.69, 2,908.61 and 1,223.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,107.69 : 2,908.61 = 1,223.53 : x
2. Step 2: Convert to fraction form
   2,107.69/2,908.61 = 1,223.53/x
3. Step 3: Cross multiply
   2,107.69x = 2,908.61 × 1,223.53
4. Step 4: Simplify right side
   2,107.69x = 3,558,760.11
5. Step 5: Solve for x
   x = 3,558,760.11/2,107.69
6. Step 6: Final answer
   x = 1,688.47