Finding the Fourth Proportional to 20,796.71, 31,198.30 and 12,474.77

Step by Step Solution

1. Step 1: Write the proportion equation
   20,796.71 : 31,198.30 = 12,474.77 : x
2. Step 2: Convert to fraction form
   20,796.71/31,198.30 = 12,474.77/x
3. Step 3: Cross multiply
   20,796.71x = 31,198.30 × 12,474.77
4. Step 4: Simplify right side
   20,796.71x = 389,191,429.71
5. Step 5: Solve for x
   x = 389,191,429.71/20,796.71
6. Step 6: Final answer
   x = 18,714.09