Finding the Fourth Proportional to 1,490.40, 2,056.69 and 860.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,490.40 : 2,056.69 = 860.83 : x
2. Step 2: Convert to fraction form
   1,490.40/2,056.69 = 860.83/x
3. Step 3: Cross multiply
   1,490.40x = 2,056.69 × 860.83
4. Step 4: Simplify right side
   1,490.40x = 1,770,456.39
5. Step 5: Solve for x
   x = 1,770,456.39/1,490.40
6. Step 6: Final answer
   x = 1,187.91