Finding the Fourth Proportional to 2,383.53, 3,288.78 and 1,388.94

Step by Step Solution

1. Step 1: Write the proportion equation
   2,383.53 : 3,288.78 = 1,388.94 : x
2. Step 2: Convert to fraction form
   2,383.53/3,288.78 = 1,388.94/x
3. Step 3: Cross multiply
   2,383.53x = 3,288.78 × 1,388.94
4. Step 4: Simplify right side
   2,383.53x = 4,567,918.09
5. Step 5: Solve for x
   x = 4,567,918.09/2,383.53
6. Step 6: Final answer
   x = 1,916.45