Finding the Fourth Proportional to 21,143.16, 31,715.27 and 7,103.69

Step by Step Solution

1. Step 1: Write the proportion equation
   21,143.16 : 31,715.27 = 7,103.69 : x
2. Step 2: Convert to fraction form
   21,143.16/31,715.27 = 7,103.69/x
3. Step 3: Cross multiply
   21,143.16x = 31,715.27 × 7,103.69
4. Step 4: Simplify right side
   21,143.16x = 225,295,305.53
5. Step 5: Solve for x
   x = 225,295,305.53/21,143.16
6. Step 6: Final answer
   x = 10,655.71