Finding the Fourth Proportional to 8,984.96, 12,399.92 and 5,209.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,984.96 : 12,399.92 = 5,209.12 : x
2. Step 2: Convert to fraction form
   8,984.96/12,399.92 = 5,209.12/x
3. Step 3: Cross multiply
   8,984.96x = 12,399.92 × 5,209.12
4. Step 4: Simplify right side
   8,984.96x = 64,592,671.27
5. Step 5: Solve for x
   x = 64,592,671.27/8,984.96
6. Step 6: Final answer
   x = 7,188.98