Finding the Fourth Proportional to 22,769.28, 31,410.72 and 13,209.12

Step by Step Solution

1. Step 1: Write the proportion equation
   22,769.28 : 31,410.72 = 13,209.12 : x
2. Step 2: Convert to fraction form
   22,769.28/31,410.72 = 13,209.12/x
3. Step 3: Cross multiply
   22,769.28x = 31,410.72 × 13,209.12
4. Step 4: Simplify right side
   22,769.28x = 414,907,969.77
5. Step 5: Solve for x
   x = 414,907,969.77/22,769.28
6. Step 6: Final answer
   x = 18,222.27