Finding the Fourth Proportional to 5,673.15, 7,820.27 and 3,989.97

Step by Step Solution

1. Step 1: Write the proportion equation
   5,673.15 : 7,820.27 = 3,989.97 : x
2. Step 2: Convert to fraction form
   5,673.15/7,820.27 = 3,989.97/x
3. Step 3: Cross multiply
   5,673.15x = 7,820.27 × 3,989.97
4. Step 4: Simplify right side
   5,673.15x = 31,202,642.69
5. Step 5: Solve for x
   x = 31,202,642.69/5,673.15
6. Step 6: Final answer
   x = 5,500.06