Finding the Fourth Proportional to 2,106.34, 2,906.57 and 1,222.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,106.34 : 2,906.57 = 1,222.20 : x
2. Step 2: Convert to fraction form
   2,106.34/2,906.57 = 1,222.20/x
3. Step 3: Cross multiply
   2,106.34x = 2,906.57 × 1,222.20
4. Step 4: Simplify right side
   2,106.34x = 3,552,409.85
5. Step 5: Solve for x
   x = 3,552,409.85/2,106.34
6. Step 6: Final answer
   x = 1,686.53