Finding the Fourth Proportional to 2,105.86, 2,906.08 and 1,222.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.86 : 2,906.08 = 1,222.18 : x
2. Step 2: Convert to fraction form
   2,105.86/2,906.08 = 1,222.18/x
3. Step 3: Cross multiply
   2,105.86x = 2,906.08 × 1,222.18
4. Step 4: Simplify right side
   2,105.86x = 3,551,752.85
5. Step 5: Solve for x
   x = 3,551,752.85/2,105.86
6. Step 6: Final answer
   x = 1,686.60