Finding the Fourth Proportional to 2,274.71, 3,138.41 and 1,389.58

Step by Step Solution

1. Step 1: Write the proportion equation
   2,274.71 : 3,138.41 = 1,389.58 : x
2. Step 2: Convert to fraction form
   2,274.71/3,138.41 = 1,389.58/x
3. Step 3: Cross multiply
   2,274.71x = 3,138.41 × 1,389.58
4. Step 4: Simplify right side
   2,274.71x = 4,361,067.40
5. Step 5: Solve for x
   x = 4,361,067.40/2,274.71
6. Step 6: Final answer
   x = 1,917.20