Finding the Fourth Proportional to 2,107.17, 2,908.16 and 1,223.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,107.17 : 2,908.16 = 1,223.25 : x
2. Step 2: Convert to fraction form
   2,107.17/2,908.16 = 1,223.25/x
3. Step 3: Cross multiply
   2,107.17x = 2,908.16 × 1,223.25
4. Step 4: Simplify right side
   2,107.17x = 3,557,406.72
5. Step 5: Solve for x
   x = 3,557,406.72/2,107.17
6. Step 6: Final answer
   x = 1,688.24