Finding the Fourth Proportional to 3,964.78, 5,471.40 and 2,196.35

Step by Step Solution

1. Step 1: Write the proportion equation
   3,964.78 : 5,471.40 = 2,196.35 : x
2. Step 2: Convert to fraction form
   3,964.78/5,471.40 = 2,196.35/x
3. Step 3: Cross multiply
   3,964.78x = 5,471.40 × 2,196.35
4. Step 4: Simplify right side
   3,964.78x = 12,017,110.79
5. Step 5: Solve for x
   x = 12,017,110.79/3,964.78
6. Step 6: Final answer
   x = 3,030.96