Finding the Fourth Proportional to 21,067.28, 31,604.04 and 7,022.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,067.28 : 31,604.04 = 7,022.72 : x
2. Step 2: Convert to fraction form
   21,067.28/31,604.04 = 7,022.72/x
3. Step 3: Cross multiply
   21,067.28x = 31,604.04 × 7,022.72
4. Step 4: Simplify right side
   21,067.28x = 221,946,323.79
5. Step 5: Solve for x
   x = 221,946,323.79/21,067.28
6. Step 6: Final answer
   x = 10,535.12