Finding the Fourth Proportional to 1,357.65, 1,872.77 and 859.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,357.65 : 1,872.77 = 859.43 : x
2. Step 2: Convert to fraction form
   1,357.65/1,872.77 = 859.43/x
3. Step 3: Cross multiply
   1,357.65x = 1,872.77 × 859.43
4. Step 4: Simplify right side
   1,357.65x = 1,609,501.06
5. Step 5: Solve for x
   x = 1,609,501.06/1,357.65
6. Step 6: Final answer
   x = 1,185.51