Finding the Fourth Proportional to 2,383.12, 3,288.92 and 1,388.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,383.12 : 3,288.92 = 1,388.72 : x
2. Step 2: Convert to fraction form
   2,383.12/3,288.92 = 1,388.72/x
3. Step 3: Cross multiply
   2,383.12x = 3,288.92 × 1,388.72
4. Step 4: Simplify right side
   2,383.12x = 4,567,365.59
5. Step 5: Solve for x
   x = 4,567,365.59/2,383.12
6. Step 6: Final answer
   x = 1,916.55