Finding the Fourth Proportional to 1,557.72, 2,149.56 and 859.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,557.72 : 2,149.56 = 859.08 : x
2. Step 2: Convert to fraction form
   1,557.72/2,149.56 = 859.08/x
3. Step 3: Cross multiply
   1,557.72x = 2,149.56 × 859.08
4. Step 4: Simplify right side
   1,557.72x = 1,846,644.00
5. Step 5: Solve for x
   x = 1,846,644.00/1,557.72
6. Step 6: Final answer
   x = 1,185.48