Finding the Fourth Proportional to 1,555.82, 2,147.06 and 857.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,555.82 : 2,147.06 = 857.18 : x
2. Step 2: Convert to fraction form
   1,555.82/2,147.06 = 857.18/x
3. Step 3: Cross multiply
   1,555.82x = 2,147.06 × 857.18
4. Step 4: Simplify right side
   1,555.82x = 1,840,416.89
5. Step 5: Solve for x
   x = 1,840,416.89/1,555.82
6. Step 6: Final answer
   x = 1,182.92