Finding the Fourth Proportional to 1,381.96, 1,907.27 and 857.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,381.96 : 1,907.27 = 857.71 : x
2. Step 2: Convert to fraction form
   1,381.96/1,907.27 = 857.71/x
3. Step 3: Cross multiply
   1,381.96x = 1,907.27 × 857.71
4. Step 4: Simplify right side
   1,381.96x = 1,635,884.55
5. Step 5: Solve for x
   x = 1,635,884.55/1,381.96
6. Step 6: Final answer
   x = 1,183.74