Finding the Fourth Proportional to 12,983.99, 17,920.22 and 12,392.35

Step by Step Solution

1. Step 1: Write the proportion equation
   12,983.99 : 17,920.22 = 12,392.35 : x
2. Step 2: Convert to fraction form
   12,983.99/17,920.22 = 12,392.35/x
3. Step 3: Cross multiply
   12,983.99x = 17,920.22 × 12,392.35
4. Step 4: Simplify right side
   12,983.99x = 222,073,531.55
5. Step 5: Solve for x
   x = 222,073,531.55/12,983.99
6. Step 6: Final answer
   x = 17,103.65