Finding the Fourth Proportional to 3,978.37, 5,488.52 and 2,717.40

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.37 : 5,488.52 = 2,717.40 : x
2. Step 2: Convert to fraction form
   3,978.37/5,488.52 = 2,717.40/x
3. Step 3: Cross multiply
   3,978.37x = 5,488.52 × 2,717.40
4. Step 4: Simplify right side
   3,978.37x = 14,914,504.25
5. Step 5: Solve for x
   x = 14,914,504.25/3,978.37
6. Step 6: Final answer
   x = 3,748.90