Finding the Fourth Proportional to 2,642.58, 3,942.59 and 2,518.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,642.58 : 3,942.59 = 2,518.74 : x
2. Step 2: Convert to fraction form
   2,642.58/3,942.59 = 2,518.74/x
3. Step 3: Cross multiply
   2,642.58x = 3,942.59 × 2,518.74
4. Step 4: Simplify right side
   2,642.58x = 9,930,346.54
5. Step 5: Solve for x
   x = 9,930,346.54/2,642.58
6. Step 6: Final answer
   x = 3,757.82