Finding the Fourth Proportional to 21,019.24, 31,529.52 and 7,869.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,019.24 : 31,529.52 = 7,869.10 : x
2. Step 2: Convert to fraction form
   21,019.24/31,529.52 = 7,869.10/x
3. Step 3: Cross multiply
   21,019.24x = 31,529.52 × 7,869.10
4. Step 4: Simplify right side
   21,019.24x = 248,108,945.83
5. Step 5: Solve for x
   x = 248,108,945.83/21,019.24
6. Step 6: Final answer
   x = 11,803.90