Finding the Fourth Proportional to 2,107.71, 2,908.71 and 1,223.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,107.71 : 2,908.71 = 1,223.46 : x
2. Step 2: Convert to fraction form
   2,107.71/2,908.71 = 1,223.46/x
3. Step 3: Cross multiply
   2,107.71x = 2,908.71 × 1,223.46
4. Step 4: Simplify right side
   2,107.71x = 3,558,690.34
5. Step 5: Solve for x
   x = 3,558,690.34/2,107.71
6. Step 6: Final answer
   x = 1,688.42