Finding the Fourth Proportional to 8,921.69, 12,311.67 and 4,942.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,921.69 : 12,311.67 = 4,942.72 : x
2. Step 2: Convert to fraction form
   8,921.69/12,311.67 = 4,942.72/x
3. Step 3: Cross multiply
   8,921.69x = 12,311.67 × 4,942.72
4. Step 4: Simplify right side
   8,921.69x = 60,853,157.57
5. Step 5: Solve for x
   x = 60,853,157.57/8,921.69
6. Step 6: Final answer
   x = 6,820.81