Finding the Fourth Proportional to 10,890.78, 16,337.18 and 3,394.39

Step by Step Solution

1. Step 1: Write the proportion equation
   10,890.78 : 16,337.18 = 3,394.39 : x
2. Step 2: Convert to fraction form
   10,890.78/16,337.18 = 3,394.39/x
3. Step 3: Cross multiply
   10,890.78x = 16,337.18 × 3,394.39
4. Step 4: Simplify right side
   10,890.78x = 55,454,760.42
5. Step 5: Solve for x
   x = 55,454,760.42/10,890.78
6. Step 6: Final answer
   x = 5,091.90