Finding the Fourth Proportional to 2,617.78, 3,615.74 and 1,957.57

Step by Step Solution

1. Step 1: Write the proportion equation
   2,617.78 : 3,615.74 = 1,957.57 : x
2. Step 2: Convert to fraction form
   2,617.78/3,615.74 = 1,957.57/x
3. Step 3: Cross multiply
   2,617.78x = 3,615.74 × 1,957.57
4. Step 4: Simplify right side
   2,617.78x = 7,078,069.05
5. Step 5: Solve for x
   x = 7,078,069.05/2,617.78
6. Step 6: Final answer
   x = 2,703.84