Finding the Fourth Proportional to 2,638.92, 3,949.78 and 1,945.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.92 : 3,949.78 = 1,945.32 : x
2. Step 2: Convert to fraction form
   2,638.92/3,949.78 = 1,945.32/x
3. Step 3: Cross multiply
   2,638.92x = 3,949.78 × 1,945.32
4. Step 4: Simplify right side
   2,638.92x = 7,683,586.03
5. Step 5: Solve for x
   x = 7,683,586.03/2,638.92
6. Step 6: Final answer
   x = 2,911.64