Finding the Fourth Proportional to 1,559.02, 2,151.45 and 860.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,559.02 : 2,151.45 = 860.38 : x
2. Step 2: Convert to fraction form
   1,559.02/2,151.45 = 860.38/x
3. Step 3: Cross multiply
   1,559.02x = 2,151.45 × 860.38
4. Step 4: Simplify right side
   1,559.02x = 1,851,064.55
5. Step 5: Solve for x
   x = 1,851,064.55/1,559.02
6. Step 6: Final answer
   x = 1,187.33