Finding the Fourth Proportional to 2,137.23, 2,949.33 and 1,389.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,137.23 : 2,949.33 = 1,389.78 : x
2. Step 2: Convert to fraction form
   2,137.23/2,949.33 = 1,389.78/x
3. Step 3: Cross multiply
   2,137.23x = 2,949.33 × 1,389.78
4. Step 4: Simplify right side
   2,137.23x = 4,098,916.37
5. Step 5: Solve for x
   x = 4,098,916.37/2,137.23
6. Step 6: Final answer
   x = 1,917.86