Finding the Fourth Proportional to 10,890.81, 16,256.28 and 9,967.41

Step by Step Solution

1. Step 1: Write the proportion equation
   10,890.81 : 16,256.28 = 9,967.41 : x
2. Step 2: Convert to fraction form
   10,890.81/16,256.28 = 9,967.41/x
3. Step 3: Cross multiply
   10,890.81x = 16,256.28 × 9,967.41
4. Step 4: Simplify right side
   10,890.81x = 162,033,007.83
5. Step 5: Solve for x
   x = 162,033,007.83/10,890.81
6. Step 6: Final answer
   x = 14,877.96