Finding the Fourth Proportional to 2,665.71, 3,673.69 and 1,918.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.71 : 3,673.69 = 1,918.38 : x
2. Step 2: Convert to fraction form
   2,665.71/3,673.69 = 1,918.38/x
3. Step 3: Cross multiply
   2,665.71x = 3,673.69 × 1,918.38
4. Step 4: Simplify right side
   2,665.71x = 7,047,542.40
5. Step 5: Solve for x
   x = 7,047,542.40/2,665.71
6. Step 6: Final answer
   x = 2,643.78