Finding the Fourth Proportional to 2,561.76, 3,840.23 and 1,390.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,561.76 : 3,840.23 = 1,390.04 : x
2. Step 2: Convert to fraction form
   2,561.76/3,840.23 = 1,390.04/x
3. Step 3: Cross multiply
   2,561.76x = 3,840.23 × 1,390.04
4. Step 4: Simplify right side
   2,561.76x = 5,338,073.31
5. Step 5: Solve for x
   x = 5,338,073.31/2,561.76
6. Step 6: Final answer
   x = 2,083.76