Finding the Fourth Proportional to 12,986.12, 17,915.94 and 7,394.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,986.12 : 17,915.94 = 7,394.12 : x
2. Step 2: Convert to fraction form
   12,986.12/17,915.94 = 7,394.12/x
3. Step 3: Cross multiply
   12,986.12x = 17,915.94 × 7,394.12
4. Step 4: Simplify right side
   12,986.12x = 132,472,610.27
5. Step 5: Solve for x
   x = 132,472,610.27/12,986.12
6. Step 6: Final answer
   x = 10,201.09