Finding the Fourth Proportional to 21,038.27, 31,561.71 and 8,558.20

Step by Step Solution

1. Step 1: Write the proportion equation
   21,038.27 : 31,561.71 = 8,558.20 : x
2. Step 2: Convert to fraction form
   21,038.27/31,561.71 = 8,558.20/x
3. Step 3: Cross multiply
   21,038.27x = 31,561.71 × 8,558.20
4. Step 4: Simplify right side
   21,038.27x = 270,111,426.52
5. Step 5: Solve for x
   x = 270,111,426.52/21,038.27
6. Step 6: Final answer
   x = 12,839.05