Finding the Fourth Proportional to 21,019.16, 31,509.38 and 7,158.52

Step by Step Solution

1. Step 1: Write the proportion equation
   21,019.16 : 31,509.38 = 7,158.52 : x
2. Step 2: Convert to fraction form
   21,019.16/31,509.38 = 7,158.52/x
3. Step 3: Cross multiply
   21,019.16x = 31,509.38 × 7,158.52
4. Step 4: Simplify right side
   21,019.16x = 225,560,526.92
5. Step 5: Solve for x
   x = 225,560,526.92/21,019.16
6. Step 6: Final answer
   x = 10,731.19