Finding the Fourth Proportional to 1,316.84, 1,974.34 and 854.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,316.84 : 1,974.34 = 854.82 : x
2. Step 2: Convert to fraction form
   1,316.84/1,974.34 = 854.82/x
3. Step 3: Cross multiply
   1,316.84x = 1,974.34 × 854.82
4. Step 4: Simplify right side
   1,316.84x = 1,687,705.32
5. Step 5: Solve for x
   x = 1,687,705.32/1,316.84
6. Step 6: Final answer
   x = 1,281.63