Finding the Fourth Proportional to 2,094.56, 3,139.05 and 861.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,094.56 : 3,139.05 = 861.23 : x
2. Step 2: Convert to fraction form
   2,094.56/3,139.05 = 861.23/x
3. Step 3: Cross multiply
   2,094.56x = 3,139.05 × 861.23
4. Step 4: Simplify right side
   2,094.56x = 2,703,455.11
5. Step 5: Solve for x
   x = 2,703,455.11/2,094.56
6. Step 6: Final answer
   x = 1,290.70