Finding the Fourth Proportional to 6,889.69, 9,507.89 and 3,905.46

Step by Step Solution

1. Step 1: Write the proportion equation
   6,889.69 : 9,507.89 = 3,905.46 : x
2. Step 2: Convert to fraction form
   6,889.69/9,507.89 = 3,905.46/x
3. Step 3: Cross multiply
   6,889.69x = 9,507.89 × 3,905.46
4. Step 4: Simplify right side
   6,889.69x = 37,132,684.08
5. Step 5: Solve for x
   x = 37,132,684.08/6,889.69
6. Step 6: Final answer
   x = 5,389.60