Finding the Fourth Proportional to 16,870.66, 25,321.43 and 8,556.42

Step by Step Solution

1. Step 1: Write the proportion equation
   16,870.66 : 25,321.43 = 8,556.42 : x
2. Step 2: Convert to fraction form
   16,870.66/25,321.43 = 8,556.42/x
3. Step 3: Cross multiply
   16,870.66x = 25,321.43 × 8,556.42
4. Step 4: Simplify right side
   16,870.66x = 216,660,790.08
5. Step 5: Solve for x
   x = 216,660,790.08/16,870.66
6. Step 6: Final answer
   x = 12,842.46