Finding the Fourth Proportional to 2,228.83, 3,076.49 and 1,389.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,228.83 : 3,076.49 = 1,389.04 : x
2. Step 2: Convert to fraction form
   2,228.83/3,076.49 = 1,389.04/x
3. Step 3: Cross multiply
   2,228.83x = 3,076.49 × 1,389.04
4. Step 4: Simplify right side
   2,228.83x = 4,273,360.72
5. Step 5: Solve for x
   x = 4,273,360.72/2,228.83
6. Step 6: Final answer
   x = 1,917.31