Finding the Fourth Proportional to 1,489.50, 2,055.61 and 860.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,489.50 : 2,055.61 = 860.15 : x
2. Step 2: Convert to fraction form
   1,489.50/2,055.61 = 860.15/x
3. Step 3: Cross multiply
   1,489.50x = 2,055.61 × 860.15
4. Step 4: Simplify right side
   1,489.50x = 1,768,124.37
5. Step 5: Solve for x
   x = 1,768,124.37/1,489.50
6. Step 6: Final answer
   x = 1,187.06