Finding the Fourth Proportional to 12,986.95, 17,919.71 and 7,679.83

Step by Step Solution

1. Step 1: Write the proportion equation
   12,986.95 : 17,919.71 = 7,679.83 : x
2. Step 2: Convert to fraction form
   12,986.95/17,919.71 = 7,679.83/x
3. Step 3: Cross multiply
   12,986.95x = 17,919.71 × 7,679.83
4. Step 4: Simplify right side
   12,986.95x = 137,620,348.85
5. Step 5: Solve for x
   x = 137,620,348.85/12,986.95
6. Step 6: Final answer
   x = 10,596.82