Finding the Fourth Proportional to 2,384.82, 3,291.24 and 1,390.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,384.82 : 3,291.24 = 1,390.40 : x
2. Step 2: Convert to fraction form
   2,384.82/3,291.24 = 1,390.40/x
3. Step 3: Cross multiply
   2,384.82x = 3,291.24 × 1,390.40
4. Step 4: Simplify right side
   2,384.82x = 4,576,140.10
5. Step 5: Solve for x
   x = 4,576,140.10/2,384.82
6. Step 6: Final answer
   x = 1,918.86