Finding the Fourth Proportional to 2,487.60, 3,728.88 and 1,392.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,487.60 : 3,728.88 = 1,392.48 : x
2. Step 2: Convert to fraction form
   2,487.60/3,728.88 = 1,392.48/x
3. Step 3: Cross multiply
   2,487.60x = 3,728.88 × 1,392.48
4. Step 4: Simplify right side
   2,487.60x = 5,192,390.82
5. Step 5: Solve for x
   x = 5,192,390.82/2,487.60
6. Step 6: Final answer
   x = 2,087.31