Finding the Fourth Proportional to 1,429.37, 2,143.83 and 389.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,429.37 : 2,143.83 = 389.43 : x
2. Step 2: Convert to fraction form
   1,429.37/2,143.83 = 389.43/x
3. Step 3: Cross multiply
   1,429.37x = 2,143.83 × 389.43
4. Step 4: Simplify right side
   1,429.37x = 834,871.72
5. Step 5: Solve for x
   x = 834,871.72/1,429.37
6. Step 6: Final answer
   x = 584.09