Finding the Fourth Proportional to 6,890.79, 9,508.59 and 3,906.89

Step by Step Solution

1. Step 1: Write the proportion equation
   6,890.79 : 9,508.59 = 3,906.89 : x
2. Step 2: Convert to fraction form
   6,890.79/9,508.59 = 3,906.89/x
3. Step 3: Cross multiply
   6,890.79x = 9,508.59 × 3,906.89
4. Step 4: Simplify right side
   6,890.79x = 37,149,015.19
5. Step 5: Solve for x
   x = 37,149,015.19/6,890.79
6. Step 6: Final answer
   x = 5,391.11