Finding the Fourth Proportional to 2,618.55, 3,945.78 and 2,166.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,618.55 : 3,945.78 = 2,166.48 : x
2. Step 2: Convert to fraction form
   2,618.55/3,945.78 = 2,166.48/x
3. Step 3: Cross multiply
   2,618.55x = 3,945.78 × 2,166.48
4. Step 4: Simplify right side
   2,618.55x = 8,548,453.45
5. Step 5: Solve for x
   x = 8,548,453.45/2,618.55
6. Step 6: Final answer
   x = 3,264.58