Finding the Fourth Proportional to 3,931.78, 5,427.12 and 2,519.27

Step by Step Solution

1. Step 1: Write the proportion equation
   3,931.78 : 5,427.12 = 2,519.27 : x
2. Step 2: Convert to fraction form
   3,931.78/5,427.12 = 2,519.27/x
3. Step 3: Cross multiply
   3,931.78x = 5,427.12 × 2,519.27
4. Step 4: Simplify right side
   3,931.78x = 13,672,380.60
5. Step 5: Solve for x
   x = 13,672,380.60/3,931.78
6. Step 6: Final answer
   x = 3,477.40