Finding the Fourth Proportional to 2,710.31, 4,064.84 and 861.08

Step by Step Solution

1. Step 1: Write the proportion equation
   2,710.31 : 4,064.84 = 861.08 : x
2. Step 2: Convert to fraction form
   2,710.31/4,064.84 = 861.08/x
3. Step 3: Cross multiply
   2,710.31x = 4,064.84 × 861.08
4. Step 4: Simplify right side
   2,710.31x = 3,500,152.43
5. Step 5: Solve for x
   x = 3,500,152.43/2,710.31
6. Step 6: Final answer
   x = 1,291.42