Finding the Fourth Proportional to 21,034.66, 31,549.89 and 8,555.42

Step by Step Solution

1. Step 1: Write the proportion equation
   21,034.66 : 31,549.89 = 8,555.42 : x
2. Step 2: Convert to fraction form
   21,034.66/31,549.89 = 8,555.42/x
3. Step 3: Cross multiply
   21,034.66x = 31,549.89 × 8,555.42
4. Step 4: Simplify right side
   21,034.66x = 269,922,559.90
5. Step 5: Solve for x
   x = 269,922,559.90/21,034.66
6. Step 6: Final answer
   x = 12,832.28