Finding the Fourth Proportional to 2,710.55, 4,066.23 and 861.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,710.55 : 4,066.23 = 861.12 : x
2. Step 2: Convert to fraction form
   2,710.55/4,066.23 = 861.12/x
3. Step 3: Cross multiply
   2,710.55x = 4,066.23 × 861.12
4. Step 4: Simplify right side
   2,710.55x = 3,501,511.98
5. Step 5: Solve for x
   x = 3,501,511.98/2,710.55
6. Step 6: Final answer
   x = 1,291.81