Finding the Fourth Proportional to 8,921.81, 12,311.63 and 4,942.83

Step by Step Solution

1. Step 1: Write the proportion equation
   8,921.81 : 12,311.63 = 4,942.83 : x
2. Step 2: Convert to fraction form
   8,921.81/12,311.63 = 4,942.83/x
3. Step 3: Cross multiply
   8,921.81x = 12,311.63 × 4,942.83
4. Step 4: Simplify right side
   8,921.81x = 60,854,334.10
5. Step 5: Solve for x
   x = 60,854,334.10/8,921.81
6. Step 6: Final answer
   x = 6,820.85