Finding the Fourth Proportional to 2,561.55, 3,839.55 and 1,242.51

Step by Step Solution

1. Step 1: Write the proportion equation
   2,561.55 : 3,839.55 = 1,242.51 : x
2. Step 2: Convert to fraction form
   2,561.55/3,839.55 = 1,242.51/x
3. Step 3: Cross multiply
   2,561.55x = 3,839.55 × 1,242.51
4. Step 4: Simplify right side
   2,561.55x = 4,770,679.27
5. Step 5: Solve for x
   x = 4,770,679.27/2,561.55
6. Step 6: Final answer
   x = 1,862.42