Finding the Fourth Proportional to 1,314.42, 1,971.42 and 855.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,314.42 : 1,971.42 = 855.46 : x
2. Step 2: Convert to fraction form
   1,314.42/1,971.42 = 855.46/x
3. Step 3: Cross multiply
   1,314.42x = 1,971.42 × 855.46
4. Step 4: Simplify right side
   1,314.42x = 1,686,470.95
5. Step 5: Solve for x
   x = 1,686,470.95/1,314.42
6. Step 6: Final answer
   x = 1,283.05