Finding the Fourth Proportional to 1,283.69, 1,771.16 and 786.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,283.69 : 1,771.16 = 786.15 : x
2. Step 2: Convert to fraction form
   1,283.69/1,771.16 = 786.15/x
3. Step 3: Cross multiply
   1,283.69x = 1,771.16 × 786.15
4. Step 4: Simplify right side
   1,283.69x = 1,392,397.43
5. Step 5: Solve for x
   x = 1,392,397.43/1,283.69
6. Step 6: Final answer
   x = 1,084.68