Finding the Fourth Proportional to 1,358.29, 1,873.72 and 860.75

Step by Step Solution

1. Step 1: Write the proportion equation
   1,358.29 : 1,873.72 = 860.75 : x
2. Step 2: Convert to fraction form
   1,358.29/1,873.72 = 860.75/x
3. Step 3: Cross multiply
   1,358.29x = 1,873.72 × 860.75
4. Step 4: Simplify right side
   1,358.29x = 1,612,790.82
5. Step 5: Solve for x
   x = 1,612,790.82/1,358.29
6. Step 6: Final answer
   x = 1,187.37