Finding the Fourth Proportional to 18,771.42, 28,148.82 and 5,621.34

Step by Step Solution

1. Step 1: Write the proportion equation
   18,771.42 : 28,148.82 = 5,621.34 : x
2. Step 2: Convert to fraction form
   18,771.42/28,148.82 = 5,621.34/x
3. Step 3: Cross multiply
   18,771.42x = 28,148.82 × 5,621.34
4. Step 4: Simplify right side
   18,771.42x = 158,234,087.82
5. Step 5: Solve for x
   x = 158,234,087.82/18,771.42
6. Step 6: Final answer
   x = 8,429.52