Finding the Fourth Proportional to 20,300.56, 27,996.63 and 12,747.61

Step by Step Solution

1. Step 1: Write the proportion equation
   20,300.56 : 27,996.63 = 12,747.61 : x
2. Step 2: Convert to fraction form
   20,300.56/27,996.63 = 12,747.61/x
3. Step 3: Cross multiply
   20,300.56x = 27,996.63 × 12,747.61
4. Step 4: Simplify right side
   20,300.56x = 356,890,120.55
5. Step 5: Solve for x
   x = 356,890,120.55/20,300.56
6. Step 6: Final answer
   x = 17,580.31