Finding the Fourth Proportional to 21,018.24, 31,528.02 and 7,868.10

Step by Step Solution

1. Step 1: Write the proportion equation
   21,018.24 : 31,528.02 = 7,868.10 : x
2. Step 2: Convert to fraction form
   21,018.24/31,528.02 = 7,868.10/x
3. Step 3: Cross multiply
   21,018.24x = 31,528.02 × 7,868.10
4. Step 4: Simplify right side
   21,018.24x = 248,065,614.16
5. Step 5: Solve for x
   x = 248,065,614.16/21,018.24
6. Step 6: Final answer
   x = 11,802.40