Finding the Fourth Proportional to 1,317.98, 1,973.75 and 854.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,317.98 : 1,973.75 = 854.34 : x
2. Step 2: Convert to fraction form
   1,317.98/1,973.75 = 854.34/x
3. Step 3: Cross multiply
   1,317.98x = 1,973.75 × 854.34
4. Step 4: Simplify right side
   1,317.98x = 1,686,249.30
5. Step 5: Solve for x
   x = 1,686,249.30/1,317.98
6. Step 6: Final answer
   x = 1,279.42