Finding the Fourth Proportional to 3,969.42, 5,477.28 and 2,290.80

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969.42 : 5,477.28 = 2,290.80 : x
2. Step 2: Convert to fraction form
   3,969.42/5,477.28 = 2,290.80/x
3. Step 3: Cross multiply
   3,969.42x = 5,477.28 × 2,290.80
4. Step 4: Simplify right side
   3,969.42x = 12,547,353.02
5. Step 5: Solve for x
   x = 12,547,353.02/3,969.42
6. Step 6: Final answer
   x = 3,161.00