Finding the Fourth Proportional to 3,964.61, 5,471.15 and 2,196.21

Step by Step Solution

1. Step 1: Write the proportion equation
   3,964.61 : 5,471.15 = 2,196.21 : x
2. Step 2: Convert to fraction form
   3,964.61/5,471.15 = 2,196.21/x
3. Step 3: Cross multiply
   3,964.61x = 5,471.15 × 2,196.21
4. Step 4: Simplify right side
   3,964.61x = 12,015,794.34
5. Step 5: Solve for x
   x = 12,015,794.34/3,964.61
6. Step 6: Final answer
   x = 3,030.76