Finding the Fourth Proportional to 20,776.29, 31,182.05 and 8,305.12

Step by Step Solution

1. Step 1: Write the proportion equation
   20,776.29 : 31,182.05 = 8,305.12 : x
2. Step 2: Convert to fraction form
   20,776.29/31,182.05 = 8,305.12/x
3. Step 3: Cross multiply
   20,776.29x = 31,182.05 × 8,305.12
4. Step 4: Simplify right side
   20,776.29x = 258,970,667.10
5. Step 5: Solve for x
   x = 258,970,667.10/20,776.29
6. Step 6: Final answer
   x = 12,464.72