Finding the Fourth Proportional to 2,810.03, 4,213.82 and 861.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,810.03 : 4,213.82 = 861.17 : x
2. Step 2: Convert to fraction form
   2,810.03/4,213.82 = 861.17/x
3. Step 3: Cross multiply
   2,810.03x = 4,213.82 × 861.17
4. Step 4: Simplify right side
   2,810.03x = 3,628,796.45
5. Step 5: Solve for x
   x = 3,628,796.45/2,810.03
6. Step 6: Final answer
   x = 1,291.38