Finding the Fourth Proportional to 2,106.66, 2,906.55 and 1,222.29

Step by Step Solution

1. Step 1: Write the proportion equation
   2,106.66 : 2,906.55 = 1,222.29 : x
2. Step 2: Convert to fraction form
   2,106.66/2,906.55 = 1,222.29/x
3. Step 3: Cross multiply
   2,106.66x = 2,906.55 × 1,222.29
4. Step 4: Simplify right side
   2,106.66x = 3,552,641.84
5. Step 5: Solve for x
   x = 3,552,641.84/2,106.66
6. Step 6: Final answer
   x = 1,686.39