Finding the Fourth Proportional to 21,016.24, 31,525.02 and 7,866.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,016.24 : 31,525.02 = 7,866.10 : x
2. Step 2: Convert to fraction form
   21,016.24/31,525.02 = 7,866.10/x
3. Step 3: Cross multiply
   21,016.24x = 31,525.02 × 7,866.10
4. Step 4: Simplify right side
   21,016.24x = 247,978,959.82
5. Step 5: Solve for x
   x = 247,978,959.82/21,016.24
6. Step 6: Final answer
   x = 11,799.40