Finding the Fourth Proportional to 3,969.72, 5,477.80 and 2,290.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969.72 : 5,477.80 = 2,290.56 : x
2. Step 2: Convert to fraction form
   3,969.72/5,477.80 = 2,290.56/x
3. Step 3: Cross multiply
   3,969.72x = 5,477.80 × 2,290.56
4. Step 4: Simplify right side
   3,969.72x = 12,547,229.57
5. Step 5: Solve for x
   x = 12,547,229.57/3,969.72
6. Step 6: Final answer
   x = 3,160.73