Finding the Fourth Proportional to 2,383.88, 3,289.62 and 1,389.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,383.88 : 3,289.62 = 1,389.32 : x
2. Step 2: Convert to fraction form
   2,383.88/3,289.62 = 1,389.32/x
3. Step 3: Cross multiply
   2,383.88x = 3,289.62 × 1,389.32
4. Step 4: Simplify right side
   2,383.88x = 4,570,334.86
5. Step 5: Solve for x
   x = 4,570,334.86/2,383.88
6. Step 6: Final answer
   x = 1,917.18