Finding the Fourth Proportional to 12,983.29, 17,920.61 and 7,679.95

Step by Step Solution

1. Step 1: Write the proportion equation
   12,983.29 : 17,920.61 = 7,679.95 : x
2. Step 2: Convert to fraction form
   12,983.29/17,920.61 = 7,679.95/x
3. Step 3: Cross multiply
   12,983.29x = 17,920.61 × 7,679.95
4. Step 4: Simplify right side
   12,983.29x = 137,629,334.37
5. Step 5: Solve for x
   x = 137,629,334.37/12,983.29
6. Step 6: Final answer
   x = 10,600.50