Finding the Fourth Proportional to 3,998.58, 5,518.71 and 2,427.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,998.58 : 5,518.71 = 2,427.72 : x
2. Step 2: Convert to fraction form
   3,998.58/5,518.71 = 2,427.72/x
3. Step 3: Cross multiply
   3,998.58x = 5,518.71 × 2,427.72
4. Step 4: Simplify right side
   3,998.58x = 13,397,882.64
5. Step 5: Solve for x
   x = 13,397,882.64/3,998.58
6. Step 6: Final answer
   x = 3,350.66