Finding the Fourth Proportional to 1,217.34, 1,676.52 and 980.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,217.34 : 1,676.52 = 980.82 : x
2. Step 2: Convert to fraction form
   1,217.34/1,676.52 = 980.82/x
3. Step 3: Cross multiply
   1,217.34x = 1,676.52 × 980.82
4. Step 4: Simplify right side
   1,217.34x = 1,644,364.35
5. Step 5: Solve for x
   x = 1,644,364.35/1,217.34
6. Step 6: Final answer
   x = 1,350.78