Finding the Fourth Proportional to 16,870.30, 25,320.87 and 8,556.05

Step by Step Solution

1. Step 1: Write the proportion equation
   16,870.30 : 25,320.87 = 8,556.05 : x
2. Step 2: Convert to fraction form
   16,870.30/25,320.87 = 8,556.05/x
3. Step 3: Cross multiply
   16,870.30x = 25,320.87 × 8,556.05
4. Step 4: Simplify right side
   16,870.30x = 216,646,629.76
5. Step 5: Solve for x
   x = 216,646,629.76/16,870.30
6. Step 6: Final answer
   x = 12,841.90