Finding the Fourth Proportional to 2,638.66, 3,949.41 and 1,945.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.66 : 3,949.41 = 1,945.05 : x
2. Step 2: Convert to fraction form
   2,638.66/3,949.41 = 1,945.05/x
3. Step 3: Cross multiply
   2,638.66x = 3,949.41 × 1,945.05
4. Step 4: Simplify right side
   2,638.66x = 7,681,790.20
5. Step 5: Solve for x
   x = 7,681,790.20/2,638.66
6. Step 6: Final answer
   x = 2,911.25