Finding the Fourth Proportional to 2,388.68, 3,287.40 and 2,020.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,388.68 : 3,287.40 = 2,020.49 : x
2. Step 2: Convert to fraction form
   2,388.68/3,287.40 = 2,020.49/x
3. Step 3: Cross multiply
   2,388.68x = 3,287.40 × 2,020.49
4. Step 4: Simplify right side
   2,388.68x = 6,642,158.83
5. Step 5: Solve for x
   x = 6,642,158.83/2,388.68
6. Step 6: Final answer
   x = 2,780.68