Finding the Fourth Proportional to 1,689.12, 2,327.94 and 1,222.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,689.12 : 2,327.94 = 1,222.56 : x
2. Step 2: Convert to fraction form
   1,689.12/2,327.94 = 1,222.56/x
3. Step 3: Cross multiply
   1,689.12x = 2,327.94 × 1,222.56
4. Step 4: Simplify right side
   1,689.12x = 2,846,046.33
5. Step 5: Solve for x
   x = 2,846,046.33/1,689.12
6. Step 6: Final answer
   x = 1,684.93