Finding the Fourth Proportional to 3,613.65, 4,986.86 and 2,020.28

Step by Step Solution

1. Step 1: Write the proportion equation
   3,613.65 : 4,986.86 = 2,020.28 : x
2. Step 2: Convert to fraction form
   3,613.65/4,986.86 = 2,020.28/x
3. Step 3: Cross multiply
   3,613.65x = 4,986.86 × 2,020.28
4. Step 4: Simplify right side
   3,613.65x = 10,074,818.49
5. Step 5: Solve for x
   x = 10,074,818.49/3,613.65
6. Step 6: Final answer
   x = 2,787.99