Finding the Fourth Proportional to 9,405.34, 12,949.80 and 7,986.04

Step by Step Solution

1. Step 1: Write the proportion equation
   9,405.34 : 12,949.80 = 7,986.04 : x
2. Step 2: Convert to fraction form
   9,405.34/12,949.80 = 7,986.04/x
3. Step 3: Cross multiply
   9,405.34x = 12,949.80 × 7,986.04
4. Step 4: Simplify right side
   9,405.34x = 103,417,620.79
5. Step 5: Solve for x
   x = 103,417,620.79/9,405.34
6. Step 6: Final answer
   x = 10,995.63