Finding the Fourth Proportional to 9,399.82, 12,942.22 and 7,980.54

Step by Step Solution

1. Step 1: Write the proportion equation
   9,399.82 : 12,942.22 = 7,980.54 : x
2. Step 2: Convert to fraction form
   9,399.82/12,942.22 = 7,980.54/x
3. Step 3: Cross multiply
   9,399.82x = 12,942.22 × 7,980.54
4. Step 4: Simplify right side
   9,399.82x = 103,285,904.40
5. Step 5: Solve for x
   x = 103,285,904.40/9,399.82
6. Step 6: Final answer
   x = 10,988.07