Finding the Fourth Proportional to 21,223.52, 31,786.75 and 10,138.00

Step by Step Solution

1. Step 1: Write the proportion equation
   21,223.52 : 31,786.75 = 10,138.00 : x
2. Step 2: Convert to fraction form
   21,223.52/31,786.75 = 10,138.00/x
3. Step 3: Cross multiply
   21,223.52x = 31,786.75 × 10,138.00
4. Step 4: Simplify right side
   21,223.52x = 322,254,064.31
5. Step 5: Solve for x
   x = 322,254,064.31/21,223.52
6. Step 6: Final answer
   x = 15,183.81