Finding the Fourth Proportional to 2,384.91, 3,578.90 and 1,290.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,384.91 : 3,578.90 = 1,290.06 : x
2. Step 2: Convert to fraction form
   2,384.91/3,578.90 = 1,290.06/x
3. Step 3: Cross multiply
   2,384.91x = 3,578.90 × 1,290.06
4. Step 4: Simplify right side
   2,384.91x = 4,616,989.28
5. Step 5: Solve for x
   x = 4,616,989.28/2,384.91
6. Step 6: Final answer
   x = 1,935.92