Finding the Fourth Proportional to 20,818.35, 28,738.71 and 13,274.82

Step by Step Solution

1. Step 1: Write the proportion equation
   20,818.35 : 28,738.71 = 13,274.82 : x
2. Step 2: Convert to fraction form
   20,818.35/28,738.71 = 13,274.82/x
3. Step 3: Cross multiply
   20,818.35x = 28,738.71 × 13,274.82
4. Step 4: Simplify right side
   20,818.35x = 381,501,202.28
5. Step 5: Solve for x
   x = 381,501,202.28/20,818.35
6. Step 6: Final answer
   x = 18,325.24