Finding the Fourth Proportional to 2,383.82, 3,289.86 and 1,389.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,383.82 : 3,289.86 = 1,389.40 : x
2. Step 2: Convert to fraction form
   2,383.82/3,289.86 = 1,389.40/x
3. Step 3: Cross multiply
   2,383.82x = 3,289.86 × 1,389.40
4. Step 4: Simplify right side
   2,383.82x = 4,570,931.48
5. Step 5: Solve for x
   x = 4,570,931.48/2,383.82
6. Step 6: Final answer
   x = 1,917.48