Finding the Fourth Proportional to 12,976.26, 17,915.79 and 9,986.82

Step by Step Solution

1. Step 1: Write the proportion equation
   12,976.26 : 17,915.79 = 9,986.82 : x
2. Step 2: Convert to fraction form
   12,976.26/17,915.79 = 9,986.82/x
3. Step 3: Cross multiply
   12,976.26x = 17,915.79 × 9,986.82
4. Step 4: Simplify right side
   12,976.26x = 178,921,769.89
5. Step 5: Solve for x
   x = 178,921,769.89/12,976.26
6. Step 6: Final answer
   x = 13,788.39