Finding the Fourth Proportional to 2,487.90, 3,728.78 and 1,393.04

Step by Step Solution

1. Step 1: Write the proportion equation
   2,487.90 : 3,728.78 = 1,393.04 : x
2. Step 2: Convert to fraction form
   2,487.90/3,728.78 = 1,393.04/x
3. Step 3: Cross multiply
   2,487.90x = 3,728.78 × 1,393.04
4. Step 4: Simplify right side
   2,487.90x = 5,194,339.69
5. Step 5: Solve for x
   x = 5,194,339.69/2,487.90
6. Step 6: Final answer
   x = 2,087.84