Finding the Fourth Proportional to 1,355.98, 1,871.22 and 858.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,355.98 : 1,871.22 = 858.46 : x
2. Step 2: Convert to fraction form
   1,355.98/1,871.22 = 858.46/x
3. Step 3: Cross multiply
   1,355.98x = 1,871.22 × 858.46
4. Step 4: Simplify right side
   1,355.98x = 1,606,367.52
5. Step 5: Solve for x
   x = 1,606,367.52/1,355.98
6. Step 6: Final answer
   x = 1,184.65