Finding the Fourth Proportional to 2,710.67, 4,065.59 and 861.91

Step by Step Solution

1. Step 1: Write the proportion equation
   2,710.67 : 4,065.59 = 861.91 : x
2. Step 2: Convert to fraction form
   2,710.67/4,065.59 = 861.91/x
3. Step 3: Cross multiply
   2,710.67x = 4,065.59 × 861.91
4. Step 4: Simplify right side
   2,710.67x = 3,504,164.67
5. Step 5: Solve for x
   x = 3,504,164.67/2,710.67
6. Step 6: Final answer
   x = 1,292.73