Finding the Fourth Proportional to 3,551.98, 5,328.78 and 1,087

Step by Step Solution

1. Step 1: Write the proportion equation
   3,551.98 : 5,328.78 = 1,087 : x
2. Step 2: Convert to fraction form
   3,551.98/5,328.78 = 1,087/x
3. Step 3: Cross multiply
   3,551.98x = 5,328.78 × 1,087
4. Step 4: Simplify right side
   3,551.98x = 5,792,383.86
5. Step 5: Solve for x
   x = 5,792,383.86/3,551.98
6. Step 6: Final answer
   x = 1,630.75