Finding the Fourth Proportional to 2,009.43, 2,772.90 and 1,223.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,009.43 : 2,772.90 = 1,223.33 : x
2. Step 2: Convert to fraction form
   2,009.43/2,772.90 = 1,223.33/x
3. Step 3: Cross multiply
   2,009.43x = 2,772.90 × 1,223.33
4. Step 4: Simplify right side
   2,009.43x = 3,392,157.89
5. Step 5: Solve for x
   x = 3,392,157.89/2,009.43
6. Step 6: Final answer
   x = 1,688.12