Finding the Fourth Proportional to 6,443.21, 9,708.72 and 5,298.85

Step by Step Solution

1. Step 1: Write the proportion equation
   6,443.21 : 9,708.72 = 5,298.85 : x
2. Step 2: Convert to fraction form
   6,443.21/9,708.72 = 5,298.85/x
3. Step 3: Cross multiply
   6,443.21x = 9,708.72 × 5,298.85
4. Step 4: Simplify right side
   6,443.21x = 51,445,050.97
5. Step 5: Solve for x
   x = 51,445,050.97/6,443.21
6. Step 6: Final answer
   x = 7,984.38