Finding the Fourth Proportional to 1,490.30, 2,056.50 and 860.54

Step by Step Solution

1. Step 1: Write the proportion equation
   1,490.30 : 2,056.50 = 860.54 : x
2. Step 2: Convert to fraction form
   1,490.30/2,056.50 = 860.54/x
3. Step 3: Cross multiply
   1,490.30x = 2,056.50 × 860.54
4. Step 4: Simplify right side
   1,490.30x = 1,769,700.51
5. Step 5: Solve for x
   x = 1,769,700.51/1,490.30
6. Step 6: Final answer
   x = 1,187.48