Finding the Fourth Proportional to 8,920.98, 12,311.42 and 5,384.43

Step by Step Solution

1. Step 1: Write the proportion equation
   8,920.98 : 12,311.42 = 5,384.43 : x
2. Step 2: Convert to fraction form
   8,920.98/12,311.42 = 5,384.43/x
3. Step 3: Cross multiply
   8,920.98x = 12,311.42 × 5,384.43
4. Step 4: Simplify right side
   8,920.98x = 66,289,952.27
5. Step 5: Solve for x
   x = 66,289,952.27/8,920.98
6. Step 6: Final answer
   x = 7,430.79