Finding the Fourth Proportional to 1,208.16, 1,667.34 and 858.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208.16 : 1,667.34 = 858.96 : x
2. Step 2: Convert to fraction form
   1,208.16/1,667.34 = 858.96/x
3. Step 3: Cross multiply
   1,208.16x = 1,667.34 × 858.96
4. Step 4: Simplify right side
   1,208.16x = 1,432,178.37
5. Step 5: Solve for x
   x = 1,432,178.37/1,208.16
6. Step 6: Final answer
   x = 1,185.42