Finding the Fourth Proportional to 3,987.98, 5,503.18 and 2,309.27

Step by Step Solution

1. Step 1: Write the proportion equation
   3,987.98 : 5,503.18 = 2,309.27 : x
2. Step 2: Convert to fraction form
   3,987.98/5,503.18 = 2,309.27/x
3. Step 3: Cross multiply
   3,987.98x = 5,503.18 × 2,309.27
4. Step 4: Simplify right side
   3,987.98x = 12,708,328.48
5. Step 5: Solve for x
   x = 12,708,328.48/3,987.98
6. Step 6: Final answer
   x = 3,186.66