Finding the Fourth Proportional to 8,921.89, 12,311.21 and 4,942.01

Step by Step Solution

1. Step 1: Write the proportion equation
   8,921.89 : 12,311.21 = 4,942.01 : x
2. Step 2: Convert to fraction form
   8,921.89/12,311.21 = 4,942.01/x
3. Step 3: Cross multiply
   8,921.89x = 12,311.21 × 4,942.01
4. Step 4: Simplify right side
   8,921.89x = 60,842,098.22
5. Step 5: Solve for x
   x = 60,842,098.22/8,921.89
6. Step 6: Final answer
   x = 6,819.42