Finding the Fourth Proportional to 8,999.64, 12,419.33 and 5,223.42

Step by Step Solution

1. Step 1: Write the proportion equation
   8,999.64 : 12,419.33 = 5,223.42 : x
2. Step 2: Convert to fraction form
   8,999.64/12,419.33 = 5,223.42/x
3. Step 3: Cross multiply
   8,999.64x = 12,419.33 × 5,223.42
4. Step 4: Simplify right side
   8,999.64x = 64,871,350.59
5. Step 5: Solve for x
   x = 64,871,350.59/8,999.64
6. Step 6: Final answer
   x = 7,208.22