Finding the Fourth Proportional to 10,912.56, 16,371.68 and 3,121.98

Step by Step Solution

1. Step 1: Write the proportion equation
   10,912.56 : 16,371.68 = 3,121.98 : x
2. Step 2: Convert to fraction form
   10,912.56/16,371.68 = 3,121.98/x
3. Step 3: Cross multiply
   10,912.56x = 16,371.68 × 3,121.98
4. Step 4: Simplify right side
   10,912.56x = 51,112,057.53
5. Step 5: Solve for x
   x = 51,112,057.53/10,912.56
6. Step 6: Final answer
   x = 4,683.78