Finding the Fourth Proportional to 20,760.98, 31,141.59 and 5,178.61

Step by Step Solution

1. Step 1: Write the proportion equation
   20,760.98 : 31,141.59 = 5,178.61 : x
2. Step 2: Convert to fraction form
   20,760.98/31,141.59 = 5,178.61/x
3. Step 3: Cross multiply
   20,760.98x = 31,141.59 × 5,178.61
4. Step 4: Simplify right side
   20,760.98x = 161,269,993.68
5. Step 5: Solve for x
   x = 161,269,993.68/20,760.98
6. Step 6: Final answer
   x = 7,767.94