Finding the Fourth Proportional to 1,490.32, 2,056.56 and 860.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,490.32 : 2,056.56 = 860.88 : x
2. Step 2: Convert to fraction form
   1,490.32/2,056.56 = 860.88/x
3. Step 3: Cross multiply
   1,490.32x = 2,056.56 × 860.88
4. Step 4: Simplify right side
   1,490.32x = 1,770,451.37
5. Step 5: Solve for x
   x = 1,770,451.37/1,490.32
6. Step 6: Final answer
   x = 1,187.97