Finding the Fourth Proportional to 8,439.02, 12,644.67 and 5,961.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,439.02 : 12,644.67 = 5,961.72 : x
2. Step 2: Convert to fraction form
   8,439.02/12,644.67 = 5,961.72/x
3. Step 3: Cross multiply
   8,439.02x = 12,644.67 × 5,961.72
4. Step 4: Simplify right side
   8,439.02x = 75,383,982.03
5. Step 5: Solve for x
   x = 75,383,982.03/8,439.02
6. Step 6: Final answer
   x = 8,932.79