Finding the Fourth Proportional to 21,054.18, 31,559.31 and 8,569.20

Step by Step Solution

1. Step 1: Write the proportion equation
   21,054.18 : 31,559.31 = 8,569.20 : x
2. Step 2: Convert to fraction form
   21,054.18/31,559.31 = 8,569.20/x
3. Step 3: Cross multiply
   21,054.18x = 31,559.31 × 8,569.20
4. Step 4: Simplify right side
   21,054.18x = 270,438,039.25
5. Step 5: Solve for x
   x = 270,438,039.25/21,054.18
6. Step 6: Final answer
   x = 12,844.86