Finding the Fourth Proportional to 2,020.40, 2,788.17 and 1,136.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,020.40 : 2,788.17 = 1,136.21 : x
2. Step 2: Convert to fraction form
   2,020.40/2,788.17 = 1,136.21/x
3. Step 3: Cross multiply
   2,020.40x = 2,788.17 × 1,136.21
4. Step 4: Simplify right side
   2,020.40x = 3,167,946.64
5. Step 5: Solve for x
   x = 3,167,946.64/2,020.40
6. Step 6: Final answer
   x = 1,567.98