Finding the Fourth Proportional to 10,921.69, 16,378.37 and 3,900.39

Step by Step Solution

1. Step 1: Write the proportion equation
   10,921.69 : 16,378.37 = 3,900.39 : x
2. Step 2: Convert to fraction form
   10,921.69/16,378.37 = 3,900.39/x
3. Step 3: Cross multiply
   10,921.69x = 16,378.37 × 3,900.39
4. Step 4: Simplify right side
   10,921.69x = 63,882,025.69
5. Step 5: Solve for x
   x = 63,882,025.69/10,921.69
6. Step 6: Final answer
   x = 5,849.10