Finding the Fourth Proportional to 10,821.42, 14,927.81 and 8,807.09

Step by Step Solution

1. Step 1: Write the proportion equation
   10,821.42 : 14,927.81 = 8,807.09 : x
2. Step 2: Convert to fraction form
   10,821.42/14,927.81 = 8,807.09/x
3. Step 3: Cross multiply
   10,821.42x = 14,927.81 × 8,807.09
4. Step 4: Simplify right side
   10,821.42x = 131,470,447.50
5. Step 5: Solve for x
   x = 131,470,447.50/10,821.42
6. Step 6: Final answer
   x = 12,149.09