Finding the Fourth Proportional to 3,989.73, 5,505.76 and 2,221.33

Step by Step Solution

1. Step 1: Write the proportion equation
   3,989.73 : 5,505.76 = 2,221.33 : x
2. Step 2: Convert to fraction form
   3,989.73/5,505.76 = 2,221.33/x
3. Step 3: Cross multiply
   3,989.73x = 5,505.76 × 2,221.33
4. Step 4: Simplify right side
   3,989.73x = 12,230,109.86
5. Step 5: Solve for x
   x = 12,230,109.86/3,989.73
6. Step 6: Final answer
   x = 3,065.40