Finding the Fourth Proportional to 3,965.00, 5,471.87 and 2,196.61

Step by Step Solution

1. Step 1: Write the proportion equation
   3,965.00 : 5,471.87 = 2,196.61 : x
2. Step 2: Convert to fraction form
   3,965.00/5,471.87 = 2,196.61/x
3. Step 3: Cross multiply
   3,965.00x = 5,471.87 × 2,196.61
4. Step 4: Simplify right side
   3,965.00x = 12,019,539.70
5. Step 5: Solve for x
   x = 12,019,539.70/3,965.00
6. Step 6: Final answer
   x = 3,031.41