Finding the Fourth Proportional to 1,872.69, 2,583.81 and 1,209.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,872.69 : 2,583.81 = 1,209.30 : x
2. Step 2: Convert to fraction form
   1,872.69/2,583.81 = 1,209.30/x
3. Step 3: Cross multiply
   1,872.69x = 2,583.81 × 1,209.30
4. Step 4: Simplify right side
   1,872.69x = 3,124,601.43
5. Step 5: Solve for x
   x = 3,124,601.43/1,872.69
6. Step 6: Final answer
   x = 1,668.51