Finding the Fourth Proportional to 9,411.58, 12,986.18 and 5,379.69

Step by Step Solution

1. Step 1: Write the proportion equation
   9,411.58 : 12,986.18 = 5,379.69 : x
2. Step 2: Convert to fraction form
   9,411.58/12,986.18 = 5,379.69/x
3. Step 3: Cross multiply
   9,411.58x = 12,986.18 × 5,379.69
4. Step 4: Simplify right side
   9,411.58x = 69,861,603.08
5. Step 5: Solve for x
   x = 69,861,603.08/9,411.58
6. Step 6: Final answer
   x = 7,422.94