Finding the Fourth Proportional to 2,065.69, 3,100.41 and 1,287.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,065.69 : 3,100.41 = 1,287.20 : x
2. Step 2: Convert to fraction form
   2,065.69/3,100.41 = 1,287.20/x
3. Step 3: Cross multiply
   2,065.69x = 3,100.41 × 1,287.20
4. Step 4: Simplify right side
   2,065.69x = 3,990,841.32
5. Step 5: Solve for x
   x = 3,990,841.32/2,065.69
6. Step 6: Final answer
   x = 1,931.97