Finding the Fourth Proportional to 2,666.45, 3,678.04 and 1,919.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,666.45 : 3,678.04 = 1,919.23 : x
2. Step 2: Convert to fraction form
   2,666.45/3,678.04 = 1,919.23/x
3. Step 3: Cross multiply
   2,666.45x = 3,678.04 × 1,919.23
4. Step 4: Simplify right side
   2,666.45x = 7,058,997.91
5. Step 5: Solve for x
   x = 7,058,997.91/2,666.45
6. Step 6: Final answer
   x = 2,647.34