Finding the Fourth Proportional to 2,561.57, 3,840.38 and 1,173.90

Step by Step Solution

1. Step 1: Write the proportion equation
   2,561.57 : 3,840.38 = 1,173.90 : x
2. Step 2: Convert to fraction form
   2,561.57/3,840.38 = 1,173.90/x
3. Step 3: Cross multiply
   2,561.57x = 3,840.38 × 1,173.90
4. Step 4: Simplify right side
   2,561.57x = 4,508,235.02
5. Step 5: Solve for x
   x = 4,508,235.02/2,561.57
6. Step 6: Final answer
   x = 1,759.95