Finding the Fourth Proportional to 3,969.18, 5,477.82 and 2,290.86

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969.18 : 5,477.82 = 2,290.86 : x
2. Step 2: Convert to fraction form
   3,969.18/5,477.82 = 2,290.86/x
3. Step 3: Cross multiply
   3,969.18x = 5,477.82 × 2,290.86
4. Step 4: Simplify right side
   3,969.18x = 12,548,891.34
5. Step 5: Solve for x
   x = 12,548,891.34/3,969.18
6. Step 6: Final answer
   x = 3,161.59