Finding the Fourth Proportional to 1,557.50, 2,149.35 and 858.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,557.50 : 2,149.35 = 858.89 : x
2. Step 2: Convert to fraction form
   1,557.50/2,149.35 = 858.89/x
3. Step 3: Cross multiply
   1,557.50x = 2,149.35 × 858.89
4. Step 4: Simplify right side
   1,557.50x = 1,846,055.22
5. Step 5: Solve for x
   x = 1,846,055.22/1,557.50
6. Step 6: Final answer
   x = 1,185.27