Finding the Fourth Proportional to 1,557.89, 2,149.86 and 859.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,557.89 : 2,149.86 = 859.27 : x
2. Step 2: Convert to fraction form
   1,557.89/2,149.86 = 859.27/x
3. Step 3: Cross multiply
   1,557.89x = 2,149.86 × 859.27
4. Step 4: Simplify right side
   1,557.89x = 1,847,302.68
5. Step 5: Solve for x
   x = 1,847,302.68/1,557.89
6. Step 6: Final answer
   x = 1,185.77