Finding the Fourth Proportional to 3,964.63, 5,471.50 and 2,196.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,964.63 : 5,471.50 = 2,196.40 : x
2. Step 2: Convert to fraction form
   3,964.63/5,471.50 = 2,196.40/x
3. Step 3: Cross multiply
   3,964.63x = 5,471.50 × 2,196.40
4. Step 4: Simplify right side
   3,964.63x = 12,017,583.43
5. Step 5: Solve for x
   x = 12,017,583.43/3,964.63
6. Step 6: Final answer
   x = 3,031.20