Finding the Fourth Proportional to 21,185.94, 31,783 and 10,658.26

Step by Step Solution

1. Step 1: Write the proportion equation
   21,185.94 : 31,783 = 10,658.26 : x
2. Step 2: Convert to fraction form
   21,185.94/31,783 = 10,658.26/x
3. Step 3: Cross multiply
   21,185.94x = 31,783 × 10,658.26
4. Step 4: Simplify right side
   21,185.94x = 338,751,477.58
5. Step 5: Solve for x
   x = 338,751,477.58/21,185.94
6. Step 6: Final answer
   x = 15,989.45