Finding the Fourth Proportional to 2,108.06, 2,908.90 and 1,223.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,108.06 : 2,908.90 = 1,223.69 : x
2. Step 2: Convert to fraction form
   2,108.06/2,908.90 = 1,223.69/x
3. Step 3: Cross multiply
   2,108.06x = 2,908.90 × 1,223.69
4. Step 4: Simplify right side
   2,108.06x = 3,559,571.18
5. Step 5: Solve for x
   x = 3,559,571.18/2,108.06
6. Step 6: Final answer
   x = 1,688.56