Finding the Fourth Proportional to 20,827.94, 31,245.55 and 13,439.52

Step by Step Solution

1. Step 1: Write the proportion equation
   20,827.94 : 31,245.55 = 13,439.52 : x
2. Step 2: Convert to fraction form
   20,827.94/31,245.55 = 13,439.52/x
3. Step 3: Cross multiply
   20,827.94x = 31,245.55 × 13,439.52
4. Step 4: Simplify right side
   20,827.94x = 419,925,160.54
5. Step 5: Solve for x
   x = 419,925,160.54/20,827.94
6. Step 6: Final answer
   x = 20,161.63