Finding the Fourth Proportional to 1,523.69, 2,102.78 and 860.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,523.69 : 2,102.78 = 860.60 : x
2. Step 2: Convert to fraction form
   1,523.69/2,102.78 = 860.60/x
3. Step 3: Cross multiply
   1,523.69x = 2,102.78 × 860.60
4. Step 4: Simplify right side
   1,523.69x = 1,809,659.88
5. Step 5: Solve for x
   x = 1,809,659.88/1,523.69
6. Step 6: Final answer
   x = 1,187.68