Finding the Fourth Proportional to 20,145.98, 30,270 and 12,753.92

Step by Step Solution

1. Step 1: Write the proportion equation
   20,145.98 : 30,270 = 12,753.92 : x
2. Step 2: Convert to fraction form
   20,145.98/30,270 = 12,753.92/x
3. Step 3: Cross multiply
   20,145.98x = 30,270 × 12,753.92
4. Step 4: Simplify right side
   20,145.98x = 386,061,158.40
5. Step 5: Solve for x
   x = 386,061,158.40/20,145.98
6. Step 6: Final answer
   x = 19,163.19