Finding the Fourth Proportional to 1,557.94, 2,149.86 and 859.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,557.94 : 2,149.86 = 859.32 : x
2. Step 2: Convert to fraction form
   1,557.94/2,149.86 = 859.32/x
3. Step 3: Cross multiply
   1,557.94x = 2,149.86 × 859.32
4. Step 4: Simplify right side
   1,557.94x = 1,847,417.70
5. Step 5: Solve for x
   x = 1,847,417.70/1,557.94
6. Step 6: Final answer
   x = 1,185.81