Finding the Fourth Proportional to 7,960.80, 10,990.96 and 5,447.10

Step by Step Solution

1. Step 1: Write the proportion equation
   7,960.80 : 10,990.96 = 5,447.10 : x
2. Step 2: Convert to fraction form
   7,960.80/10,990.96 = 5,447.10/x
3. Step 3: Cross multiply
   7,960.80x = 10,990.96 × 5,447.10
4. Step 4: Simplify right side
   7,960.80x = 59,868,858.22
5. Step 5: Solve for x
   x = 59,868,858.22/7,960.80
6. Step 6: Final answer
   x = 7,520.46