Finding the Fourth Proportional to 31,145.24, 46,689.78 and 21,153.38

Step by Step Solution

1. Step 1: Write the proportion equation
   31,145.24 : 46,689.78 = 21,153.38 : x
2. Step 2: Convert to fraction form
   31,145.24/46,689.78 = 21,153.38/x
3. Step 3: Cross multiply
   31,145.24x = 46,689.78 × 21,153.38
4. Step 4: Simplify right side
   31,145.24x = 987,646,658.46
5. Step 5: Solve for x
   x = 987,646,658.46/31,145.24
6. Step 6: Final answer
   x = 31,711.00