Finding the Fourth Proportional to 3,839.56, 5,755.60 and 1,240.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,839.56 : 5,755.60 = 1,240.72 : x
2. Step 2: Convert to fraction form
   3,839.56/5,755.60 = 1,240.72/x
3. Step 3: Cross multiply
   3,839.56x = 5,755.60 × 1,240.72
4. Step 4: Simplify right side
   3,839.56x = 7,141,088.03
5. Step 5: Solve for x
   x = 7,141,088.03/3,839.56
6. Step 6: Final answer
   x = 1,859.87