Finding the Fourth Proportional to 2,273.81, 3,137.90 and 1,389.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,273.81 : 3,137.90 = 1,389.43 : x
2. Step 2: Convert to fraction form
   2,273.81/3,137.90 = 1,389.43/x
3. Step 3: Cross multiply
   2,273.81x = 3,137.90 × 1,389.43
4. Step 4: Simplify right side
   2,273.81x = 4,359,877.61
5. Step 5: Solve for x
   x = 4,359,877.61/2,273.81
6. Step 6: Final answer
   x = 1,917.43