Finding the Fourth Proportional to 3,989.85, 5,505.77 and 2,196.98

Step by Step Solution

1. Step 1: Write the proportion equation
   3,989.85 : 5,505.77 = 2,196.98 : x
2. Step 2: Convert to fraction form
   3,989.85/5,505.77 = 2,196.98/x
3. Step 3: Cross multiply
   3,989.85x = 5,505.77 × 2,196.98
4. Step 4: Simplify right side
   3,989.85x = 12,096,066.57
5. Step 5: Solve for x
   x = 12,096,066.57/3,989.85
6. Step 6: Final answer
   x = 3,031.71