Finding the Fourth Proportional to 30,559.14, 42,169.32 and 18,621

Step by Step Solution

1. Step 1: Write the proportion equation
   30,559.14 : 42,169.32 = 18,621 : x
2. Step 2: Convert to fraction form
   30,559.14/42,169.32 = 18,621/x
3. Step 3: Cross multiply
   30,559.14x = 42,169.32 × 18,621
4. Step 4: Simplify right side
   30,559.14x = 785,234,907.72
5. Step 5: Solve for x
   x = 785,234,907.72/30,559.14
6. Step 6: Final answer
   x = 25,695.58