Finding the Fourth Proportional to 2,105.98, 2,906.20 and 1,222.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.98 : 2,906.20 = 1,222.06 : x
2. Step 2: Convert to fraction form
   2,105.98/2,906.20 = 1,222.06/x
3. Step 3: Cross multiply
   2,105.98x = 2,906.20 × 1,222.06
4. Step 4: Simplify right side
   2,105.98x = 3,551,550.77
5. Step 5: Solve for x
   x = 3,551,550.77/2,105.98
6. Step 6: Final answer
   x = 1,686.41