Finding the Fourth Proportional to 3,907.89, 5,392.92 and 2,139.53

Step by Step Solution

1. Step 1: Write the proportion equation
   3,907.89 : 5,392.92 = 2,139.53 : x
2. Step 2: Convert to fraction form
   3,907.89/5,392.92 = 2,139.53/x
3. Step 3: Cross multiply
   3,907.89x = 5,392.92 × 2,139.53
4. Step 4: Simplify right side
   3,907.89x = 11,538,287.16
5. Step 5: Solve for x
   x = 11,538,287.16/3,907.89
6. Step 6: Final answer
   x = 2,952.56