Finding the Fourth Proportional to 20,260.34, 30,399.59 and 12,862.82

Step by Step Solution

1. Step 1: Write the proportion equation
   20,260.34 : 30,399.59 = 12,862.82 : x
2. Step 2: Convert to fraction form
   20,260.34/30,399.59 = 12,862.82/x
3. Step 3: Cross multiply
   20,260.34x = 30,399.59 × 12,862.82
4. Step 4: Simplify right side
   20,260.34x = 391,024,334.40
5. Step 5: Solve for x
   x = 391,024,334.40/20,260.34
6. Step 6: Final answer
   x = 19,299.99