Finding the Fourth Proportional to 2,021.07, 2,789.78 and 1,224.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,021.07 : 2,789.78 = 1,224.43 : x
2. Step 2: Convert to fraction form
   2,021.07/2,789.78 = 1,224.43/x
3. Step 3: Cross multiply
   2,021.07x = 2,789.78 × 1,224.43
4. Step 4: Simplify right side
   2,021.07x = 3,415,890.33
5. Step 5: Solve for x
   x = 3,415,890.33/2,021.07
6. Step 6: Final answer
   x = 1,690.14