Finding the Fourth Proportional to 3,606.78, 5,407.65 and 1,964.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,606.78 : 5,407.65 = 1,964.10 : x
2. Step 2: Convert to fraction form
   3,606.78/5,407.65 = 1,964.10/x
3. Step 3: Cross multiply
   3,606.78x = 5,407.65 × 1,964.10
4. Step 4: Simplify right side
   3,606.78x = 10,621,165.37
5. Step 5: Solve for x
   x = 10,621,165.37/3,606.78
6. Step 6: Final answer
   x = 2,944.78