Finding the Fourth Proportional to 2,189.79, 3,284.72 and 1,222.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,189.79 : 3,284.72 = 1,222.05 : x
2. Step 2: Convert to fraction form
   2,189.79/3,284.72 = 1,222.05/x
3. Step 3: Cross multiply
   2,189.79x = 3,284.72 × 1,222.05
4. Step 4: Simplify right side
   2,189.79x = 4,014,085.97
5. Step 5: Solve for x
   x = 4,014,085.97/2,189.79
6. Step 6: Final answer
   x = 1,833.09