Finding the Fourth Proportional to 2,639.16, 3,950.16 and 1,945.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.16 : 3,950.16 = 1,945.55 : x
2. Step 2: Convert to fraction form
   2,639.16/3,950.16 = 1,945.55/x
3. Step 3: Cross multiply
   2,639.16x = 3,950.16 × 1,945.55
4. Step 4: Simplify right side
   2,639.16x = 7,685,224.06
5. Step 5: Solve for x
   x = 7,685,224.06/2,639.16
6. Step 6: Final answer
   x = 2,912.00