Finding the Fourth Proportional to 2,710.47, 4,064.49 and 861.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,710.47 : 4,064.49 = 861.24 : x
2. Step 2: Convert to fraction form
   2,710.47/4,064.49 = 861.24/x
3. Step 3: Cross multiply
   2,710.47x = 4,064.49 × 861.24
4. Step 4: Simplify right side
   2,710.47x = 3,500,501.37
5. Step 5: Solve for x
   x = 3,500,501.37/2,710.47
6. Step 6: Final answer
   x = 1,291.47