Finding the Fourth Proportional to 9,399.83, 12,942.23 and 7,980.54

Step by Step Solution

1. Step 1: Write the proportion equation
   9,399.83 : 12,942.23 = 7,980.54 : x
2. Step 2: Convert to fraction form
   9,399.83/12,942.23 = 7,980.54/x
3. Step 3: Cross multiply
   9,399.83x = 12,942.23 × 7,980.54
4. Step 4: Simplify right side
   9,399.83x = 103,285,944.30
5. Step 5: Solve for x
   x = 103,285,944.30/9,399.83
6. Step 6: Final answer
   x = 10,988.07