Finding the Fourth Proportional to 2,105.96, 2,906.01 and 1,222.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.96 : 2,906.01 = 1,222.05 : x
2. Step 2: Convert to fraction form
   2,105.96/2,906.01 = 1,222.05/x
3. Step 3: Cross multiply
   2,105.96x = 2,906.01 × 1,222.05
4. Step 4: Simplify right side
   2,105.96x = 3,551,289.52
5. Step 5: Solve for x
   x = 3,551,289.52/2,105.96
6. Step 6: Final answer
   x = 1,686.30