Finding the Fourth Proportional to 2,094.06, 3,139.47 and 861.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,094.06 : 3,139.47 = 861.78 : x
2. Step 2: Convert to fraction form
   2,094.06/3,139.47 = 861.78/x
3. Step 3: Cross multiply
   2,094.06x = 3,139.47 × 861.78
4. Step 4: Simplify right side
   2,094.06x = 2,705,532.46
5. Step 5: Solve for x
   x = 2,705,532.46/2,094.06
6. Step 6: Final answer
   x = 1,292.00