Finding the Fourth Proportional to 1,490.27, 2,056.55 and 860.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,490.27 : 2,056.55 = 860.75 : x
2. Step 2: Convert to fraction form
   1,490.27/2,056.55 = 860.75/x
3. Step 3: Cross multiply
   1,490.27x = 2,056.55 × 860.75
4. Step 4: Simplify right side
   1,490.27x = 1,770,160.83
5. Step 5: Solve for x
   x = 1,770,160.83/1,490.27
6. Step 6: Final answer
   x = 1,187.82