Finding the Fourth Proportional to 9,406.09, 12,950.85 and 7,986.79

Step by Step Solution

1. Step 1: Write the proportion equation
   9,406.09 : 12,950.85 = 7,986.79 : x
2. Step 2: Convert to fraction form
   9,406.09/12,950.85 = 7,986.79/x
3. Step 3: Cross multiply
   9,406.09x = 12,950.85 × 7,986.79
4. Step 4: Simplify right side
   9,406.09x = 103,435,719.27
5. Step 5: Solve for x
   x = 103,435,719.27/9,406.09
6. Step 6: Final answer
   x = 10,996.68