Finding the Fourth Proportional to 10,685.10, 16,107.69 and 9,971.49

Step by Step Solution

1. Step 1: Write the proportion equation
   10,685.10 : 16,107.69 = 9,971.49 : x
2. Step 2: Convert to fraction form
   10,685.10/16,107.69 = 9,971.49/x
3. Step 3: Cross multiply
   10,685.10x = 16,107.69 × 9,971.49
4. Step 4: Simplify right side
   10,685.10x = 160,617,669.76
5. Step 5: Solve for x
   x = 160,617,669.76/10,685.10
6. Step 6: Final answer
   x = 15,031.93