Finding the Fourth Proportional to 21,065.28, 31,601.04 and 7,020.72

Step by Step Solution

1. Step 1: Write the proportion equation
   21,065.28 : 31,601.04 = 7,020.72 : x
2. Step 2: Convert to fraction form
   21,065.28/31,601.04 = 7,020.72/x
3. Step 3: Cross multiply
   21,065.28x = 31,601.04 × 7,020.72
4. Step 4: Simplify right side
   21,065.28x = 221,862,053.55
5. Step 5: Solve for x
   x = 221,862,053.55/21,065.28
6. Step 6: Final answer
   x = 10,532.12