Finding the Fourth Proportional to 10,968.72, 16,433.88 and 9,131.64

Step by Step Solution

1. Step 1: Write the proportion equation
   10,968.72 : 16,433.88 = 9,131.64 : x
2. Step 2: Convert to fraction form
   10,968.72/16,433.88 = 9,131.64/x
3. Step 3: Cross multiply
   10,968.72x = 16,433.88 × 9,131.64
4. Step 4: Simplify right side
   10,968.72x = 150,068,275.96
5. Step 5: Solve for x
   x = 150,068,275.96/10,968.72
6. Step 6: Final answer
   x = 13,681.48