Finding the Fourth Proportional to 3,989.12, 5,504.76 and 2,196.59

Step by Step Solution

1. Step 1: Write the proportion equation
   3,989.12 : 5,504.76 = 2,196.59 : x
2. Step 2: Convert to fraction form
   3,989.12/5,504.76 = 2,196.59/x
3. Step 3: Cross multiply
   3,989.12x = 5,504.76 × 2,196.59
4. Step 4: Simplify right side
   3,989.12x = 12,091,673.24
5. Step 5: Solve for x
   x = 12,091,673.24/3,989.12
6. Step 6: Final answer
   x = 3,031.17