Finding the Fourth Proportional to 30,578.28, 45,864.34 and 8,393.89

Step by Step Solution

1. Step 1: Write the proportion equation
   30,578.28 : 45,864.34 = 8,393.89 : x
2. Step 2: Convert to fraction form
   30,578.28/45,864.34 = 8,393.89/x
3. Step 3: Cross multiply
   30,578.28x = 45,864.34 × 8,393.89
4. Step 4: Simplify right side
   30,578.28x = 384,980,224.88
5. Step 5: Solve for x
   x = 384,980,224.88/30,578.28
6. Step 6: Final answer
   x = 12,589.99