Finding the Fourth Proportional to 2,092.74, 3,138.27 and 860.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,092.74 : 3,138.27 = 860.10 : x
2. Step 2: Convert to fraction form
   2,092.74/3,138.27 = 860.10/x
3. Step 3: Cross multiply
   2,092.74x = 3,138.27 × 860.10
4. Step 4: Simplify right side
   2,092.74x = 2,699,226.03
5. Step 5: Solve for x
   x = 2,699,226.03/2,092.74
6. Step 6: Final answer
   x = 1,289.80