Finding the Fourth Proportional to 2,383.65, 3,289.52 and 1,388.77

Step by Step Solution

1. Step 1: Write the proportion equation
   2,383.65 : 3,289.52 = 1,388.77 : x
2. Step 2: Convert to fraction form
   2,383.65/3,289.52 = 1,388.77/x
3. Step 3: Cross multiply
   2,383.65x = 3,289.52 × 1,388.77
4. Step 4: Simplify right side
   2,383.65x = 4,568,381.94
5. Step 5: Solve for x
   x = 4,568,381.94/2,383.65
6. Step 6: Final answer
   x = 1,916.55