Finding the Fourth Proportional to 2,628.36, 3,940.72 and 1,240.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,628.36 : 3,940.72 = 1,240.53 : x
2. Step 2: Convert to fraction form
   2,628.36/3,940.72 = 1,240.53/x
3. Step 3: Cross multiply
   2,628.36x = 3,940.72 × 1,240.53
4. Step 4: Simplify right side
   2,628.36x = 4,888,563.50
5. Step 5: Solve for x
   x = 4,888,563.50/2,628.36
6. Step 6: Final answer
   x = 1,859.93