Finding the Fourth Proportional to 3,989.08, 5,505.00 and 2,196.55

Step by Step Solution

1. Step 1: Write the proportion equation
   3,989.08 : 5,505.00 = 2,196.55 : x
2. Step 2: Convert to fraction form
   3,989.08/5,505.00 = 2,196.55/x
3. Step 3: Cross multiply
   3,989.08x = 5,505.00 × 2,196.55
4. Step 4: Simplify right side
   3,989.08x = 12,092,022.87
5. Step 5: Solve for x
   x = 12,092,022.87/3,989.08
6. Step 6: Final answer
   x = 3,031.28