Finding the Fourth Proportional to 6,890.30, 9,508.89 and 3,906.50

Step by Step Solution

1. Step 1: Write the proportion equation
   6,890.30 : 9,508.89 = 3,906.50 : x
2. Step 2: Convert to fraction form
   6,890.30/9,508.89 = 3,906.50/x
3. Step 3: Cross multiply
   6,890.30x = 9,508.89 × 3,906.50
4. Step 4: Simplify right side
   6,890.30x = 37,146,478.79
5. Step 5: Solve for x
   x = 37,146,478.79/6,890.30
6. Step 6: Final answer
   x = 5,391.13