Finding the Fourth Proportional to 8,921.60, 12,311.79 and 4,942.71

Step by Step Solution

1. Step 1: Write the proportion equation
   8,921.60 : 12,311.79 = 4,942.71 : x
2. Step 2: Convert to fraction form
   8,921.60/12,311.79 = 4,942.71/x
3. Step 3: Cross multiply
   8,921.60x = 12,311.79 × 4,942.71
4. Step 4: Simplify right side
   8,921.60x = 60,853,607.55
5. Step 5: Solve for x
   x = 60,853,607.55/8,921.60
6. Step 6: Final answer
   x = 6,820.93