Finding the Fourth Proportional to 2,615.49, 3,919.59 and 1,791.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,615.49 : 3,919.59 = 1,791.72 : x
2. Step 2: Convert to fraction form
   2,615.49/3,919.59 = 1,791.72/x
3. Step 3: Cross multiply
   2,615.49x = 3,919.59 × 1,791.72
4. Step 4: Simplify right side
   2,615.49x = 7,022,807.79
5. Step 5: Solve for x
   x = 7,022,807.79/2,615.49
6. Step 6: Final answer
   x = 2,685.08