Finding the Fourth Proportional to 10,399.34, 15,604.41 and 7,949.90

Step by Step Solution

1. Step 1: Write the proportion equation
   10,399.34 : 15,604.41 = 7,949.90 : x
2. Step 2: Convert to fraction form
   10,399.34/15,604.41 = 7,949.90/x
3. Step 3: Cross multiply
   10,399.34x = 15,604.41 × 7,949.90
4. Step 4: Simplify right side
   10,399.34x = 124,053,499.06
5. Step 5: Solve for x
   x = 124,053,499.06/10,399.34
6. Step 6: Final answer
   x = 11,928.98