Finding the Fourth Proportional to 2,921.64, 4,399.59 and 2,105.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,921.64 : 4,399.59 = 2,105.57 : x
2. Step 2: Convert to fraction form
   2,921.64/4,399.59 = 2,105.57/x
3. Step 3: Cross multiply
   2,921.64x = 4,399.59 × 2,105.57
4. Step 4: Simplify right side
   2,921.64x = 9,263,622.72
5. Step 5: Solve for x
   x = 9,263,622.72/2,921.64
6. Step 6: Final answer
   x = 3,170.69