Finding the Fourth Proportional to 3,969.50, 5,477.42 and 2,290.88

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969.50 : 5,477.42 = 2,290.88 : x
2. Step 2: Convert to fraction form
   3,969.50/5,477.42 = 2,290.88/x
3. Step 3: Cross multiply
   3,969.50x = 5,477.42 × 2,290.88
4. Step 4: Simplify right side
   3,969.50x = 12,548,131.35
5. Step 5: Solve for x
   x = 12,548,131.35/3,969.50
6. Step 6: Final answer
   x = 3,161.14