Finding the Fourth Proportional to 10,912.82, 16,369.16 and 3,121.63

Step by Step Solution

1. Step 1: Write the proportion equation
   10,912.82 : 16,369.16 = 3,121.63 : x
2. Step 2: Convert to fraction form
   10,912.82/16,369.16 = 3,121.63/x
3. Step 3: Cross multiply
   10,912.82x = 16,369.16 × 3,121.63
4. Step 4: Simplify right side
   10,912.82x = 51,098,404.40
5. Step 5: Solve for x
   x = 51,098,404.40/10,912.82
6. Step 6: Final answer
   x = 4,682.42