Finding the Fourth Proportional to 10,942.20, 16,403.46 and 3,921

Step by Step Solution

1. Step 1: Write the proportion equation
   10,942.20 : 16,403.46 = 3,921 : x
2. Step 2: Convert to fraction form
   10,942.20/16,403.46 = 3,921/x
3. Step 3: Cross multiply
   10,942.20x = 16,403.46 × 3,921
4. Step 4: Simplify right side
   10,942.20x = 64,317,966.66
5. Step 5: Solve for x
   x = 64,317,966.66/10,942.20
6. Step 6: Final answer
   x = 5,877.97