Finding the Fourth Proportional to 3,809.56, 5,709.78 and 1,961.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,809.56 : 5,709.78 = 1,961.56 : x
2. Step 2: Convert to fraction form
   3,809.56/5,709.78 = 1,961.56/x
3. Step 3: Cross multiply
   3,809.56x = 5,709.78 × 1,961.56
4. Step 4: Simplify right side
   3,809.56x = 11,200,076.06
5. Step 5: Solve for x
   x = 11,200,076.06/3,809.56
6. Step 6: Final answer
   x = 2,939.99