Finding the Fourth Proportional to 1,872.72, 2,583.63 and 1,209.33

Step by Step Solution

1. Step 1: Write the proportion equation
   1,872.72 : 2,583.63 = 1,209.33 : x
2. Step 2: Convert to fraction form
   1,872.72/2,583.63 = 1,209.33/x
3. Step 3: Cross multiply
   1,872.72x = 2,583.63 × 1,209.33
4. Step 4: Simplify right side
   1,872.72x = 3,124,461.27
5. Step 5: Solve for x
   x = 3,124,461.27/1,872.72
6. Step 6: Final answer
   x = 1,668.41