Finding the Fourth Proportional to 2,106.48, 2,906.72 and 1,222.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,106.48 : 2,906.72 = 1,222.48 : x
2. Step 2: Convert to fraction form
   2,106.48/2,906.72 = 1,222.48/x
3. Step 3: Cross multiply
   2,106.48x = 2,906.72 × 1,222.48
4. Step 4: Simplify right side
   2,106.48x = 3,553,407.07
5. Step 5: Solve for x
   x = 3,553,407.07/2,106.48
6. Step 6: Final answer
   x = 1,686.89