Finding the Fourth Proportional to 6,889.25, 10,330.43 and 3,188.31

Step by Step Solution

1. Step 1: Write the proportion equation
   6,889.25 : 10,330.43 = 3,188.31 : x
2. Step 2: Convert to fraction form
   6,889.25/10,330.43 = 3,188.31/x
3. Step 3: Cross multiply
   6,889.25x = 10,330.43 × 3,188.31
4. Step 4: Simplify right side
   6,889.25x = 32,936,613.27
5. Step 5: Solve for x
   x = 32,936,613.27/6,889.25
6. Step 6: Final answer
   x = 4,780.87