Finding the Fourth Proportional to 2,710.58, 4,066.43 and 861.45

Step by Step Solution

1. Step 1: Write the proportion equation
   2,710.58 : 4,066.43 = 861.45 : x
2. Step 2: Convert to fraction form
   2,710.58/4,066.43 = 861.45/x
3. Step 3: Cross multiply
   2,710.58x = 4,066.43 × 861.45
4. Step 4: Simplify right side
   2,710.58x = 3,503,021.82
5. Step 5: Solve for x
   x = 3,503,021.82/2,710.58
6. Step 6: Final answer
   x = 1,292.35