Finding the Fourth Proportional to 30,576.28, 45,861.34 and 8,391.89

Step by Step Solution

1. Step 1: Write the proportion equation
   30,576.28 : 45,861.34 = 8,391.89 : x
2. Step 2: Convert to fraction form
   30,576.28/45,861.34 = 8,391.89/x
3. Step 3: Cross multiply
   30,576.28x = 45,861.34 × 8,391.89
4. Step 4: Simplify right side
   30,576.28x = 384,863,320.53
5. Step 5: Solve for x
   x = 384,863,320.53/30,576.28
6. Step 6: Final answer
   x = 12,586.99