Finding the Fourth Proportional to 1,357.91, 1,872.84 and 860.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,357.91 : 1,872.84 = 860.06 : x
2. Step 2: Convert to fraction form
   1,357.91/1,872.84 = 860.06/x
3. Step 3: Cross multiply
   1,357.91x = 1,872.84 × 860.06
4. Step 4: Simplify right side
   1,357.91x = 1,610,759.45
5. Step 5: Solve for x
   x = 1,610,759.45/1,357.91
6. Step 6: Final answer
   x = 1,186.21