Finding the Fourth Proportional to 10,980.96, 16,391.52 and 10,168.80

Step by Step Solution

1. Step 1: Write the proportion equation
   10,980.96 : 16,391.52 = 10,168.80 : x
2. Step 2: Convert to fraction form
   10,980.96/16,391.52 = 10,168.80/x
3. Step 3: Cross multiply
   10,980.96x = 16,391.52 × 10,168.80
4. Step 4: Simplify right side
   10,980.96x = 166,682,088.58
5. Step 5: Solve for x
   x = 166,682,088.58/10,980.96
6. Step 6: Final answer
   x = 15,179.19