Finding the Fourth Proportional to 10,872.81, 16,235.33 and 10,256.81

Step by Step Solution

1. Step 1: Write the proportion equation
   10,872.81 : 16,235.33 = 10,256.81 : x
2. Step 2: Convert to fraction form
   10,872.81/16,235.33 = 10,256.81/x
3. Step 3: Cross multiply
   10,872.81x = 16,235.33 × 10,256.81
4. Step 4: Simplify right side
   10,872.81x = 166,522,562.64
5. Step 5: Solve for x
   x = 166,522,562.64/10,872.81
6. Step 6: Final answer
   x = 15,315.50