Finding the Fourth Proportional to 1,358.76, 1,874.91 and 860.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,358.76 : 1,874.91 = 860.52 : x
2. Step 2: Convert to fraction form
   1,358.76/1,874.91 = 860.52/x
3. Step 3: Cross multiply
   1,358.76x = 1,874.91 × 860.52
4. Step 4: Simplify right side
   1,358.76x = 1,613,397.55
5. Step 5: Solve for x
   x = 1,613,397.55/1,358.76
6. Step 6: Final answer
   x = 1,187.40