Finding the Fourth Proportional to 1,357.49, 1,872.69 and 860.87

Step by Step Solution

1. Step 1: Write the proportion equation
   1,357.49 : 1,872.69 = 860.87 : x
2. Step 2: Convert to fraction form
   1,357.49/1,872.69 = 860.87/x
3. Step 3: Cross multiply
   1,357.49x = 1,872.69 × 860.87
4. Step 4: Simplify right side
   1,357.49x = 1,612,142.64
5. Step 5: Solve for x
   x = 1,612,142.64/1,357.49
6. Step 6: Final answer
   x = 1,187.59