Finding the Fourth Proportional to 2,993.61, 4,118.61 and 2,911.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,993.61 : 4,118.61 = 2,911.60 : x
2. Step 2: Convert to fraction form
   2,993.61/4,118.61 = 2,911.60/x
3. Step 3: Cross multiply
   2,993.61x = 4,118.61 × 2,911.60
4. Step 4: Simplify right side
   2,993.61x = 11,991,744.88
5. Step 5: Solve for x
   x = 11,991,744.88/2,993.61
6. Step 6: Final answer
   x = 4,005.78