Finding the Fourth Proportional to 2,144.94, 2,958.63 and 1,389.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,144.94 : 2,958.63 = 1,389.69 : x
2. Step 2: Convert to fraction form
   2,144.94/2,958.63 = 1,389.69/x
3. Step 3: Cross multiply
   2,144.94x = 2,958.63 × 1,389.69
4. Step 4: Simplify right side
   2,144.94x = 4,111,578.52
5. Step 5: Solve for x
   x = 4,111,578.52/2,144.94
6. Step 6: Final answer
   x = 1,916.87