Finding the Fourth Proportional to 3,969.42, 5,477.57 and 2,290.70

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969.42 : 5,477.57 = 2,290.70 : x
2. Step 2: Convert to fraction form
   3,969.42/5,477.57 = 2,290.70/x
3. Step 3: Cross multiply
   3,969.42x = 5,477.57 × 2,290.70
4. Step 4: Simplify right side
   3,969.42x = 12,547,462.50
5. Step 5: Solve for x
   x = 12,547,462.50/3,969.42
6. Step 6: Final answer
   x = 3,161.03