Finding the Fourth Proportional to 2,561.55, 3,839.06 and 1,245.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,561.55 : 3,839.06 = 1,245.60 : x
2. Step 2: Convert to fraction form
   2,561.55/3,839.06 = 1,245.60/x
3. Step 3: Cross multiply
   2,561.55x = 3,839.06 × 1,245.60
4. Step 4: Simplify right side
   2,561.55x = 4,781,933.14
5. Step 5: Solve for x
   x = 4,781,933.14/2,561.55
6. Step 6: Final answer
   x = 1,866.81