Finding the Fourth Proportional to 3,947.31, 5,906.37 and 3,247.47

Step by Step Solution

1. Step 1: Write the proportion equation
   3,947.31 : 5,906.37 = 3,247.47 : x
2. Step 2: Convert to fraction form
   3,947.31/5,906.37 = 3,247.47/x
3. Step 3: Cross multiply
   3,947.31x = 5,906.37 × 3,247.47
4. Step 4: Simplify right side
   3,947.31x = 19,180,759.38
5. Step 5: Solve for x
   x = 19,180,759.38/3,947.31
6. Step 6: Final answer
   x = 4,859.20