Finding the Fourth Proportional to 2,661.98, 3,673.88 and 1,918.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.98 : 3,673.88 = 1,918.40 : x
2. Step 2: Convert to fraction form
   2,661.98/3,673.88 = 1,918.40/x
3. Step 3: Cross multiply
   2,661.98x = 3,673.88 × 1,918.40
4. Step 4: Simplify right side
   2,661.98x = 7,047,943.43
5. Step 5: Solve for x
   x = 7,047,943.43/2,661.98
6. Step 6: Final answer
   x = 2,647.64