Finding the Fourth Proportional to 1,211.49, 1,671.89 and 858.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,211.49 : 1,671.89 = 858.04 : x
2. Step 2: Convert to fraction form
   1,211.49/1,671.89 = 858.04/x
3. Step 3: Cross multiply
   1,211.49x = 1,671.89 × 858.04
4. Step 4: Simplify right side
   1,211.49x = 1,434,548.50
5. Step 5: Solve for x
   x = 1,434,548.50/1,211.49
6. Step 6: Final answer
   x = 1,184.12