Finding the Fourth Proportional to 2,384.78, 3,291.08 and 1,389.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,384.78 : 3,291.08 = 1,389.89 : x
2. Step 2: Convert to fraction form
   2,384.78/3,291.08 = 1,389.89/x
3. Step 3: Cross multiply
   2,384.78x = 3,291.08 × 1,389.89
4. Step 4: Simplify right side
   2,384.78x = 4,574,240.46
5. Step 5: Solve for x
   x = 4,574,240.46/2,384.78
6. Step 6: Final answer
   x = 1,918.10