Finding the Fourth Proportional to 2,710.69, 4,065.61 and 861.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,710.69 : 4,065.61 = 861.56 : x
2. Step 2: Convert to fraction form
   2,710.69/4,065.61 = 861.56/x
3. Step 3: Cross multiply
   2,710.69x = 4,065.61 × 861.56
4. Step 4: Simplify right side
   2,710.69x = 3,502,766.95
5. Step 5: Solve for x
   x = 3,502,766.95/2,710.69
6. Step 6: Final answer
   x = 1,292.20