Finding the Fourth Proportional to 1,196.80, 1,796.38 and 980

Step by Step Solution

1. Step 1: Write the proportion equation
   1,196.80 : 1,796.38 = 980 : x
2. Step 2: Convert to fraction form
   1,196.80/1,796.38 = 980/x
3. Step 3: Cross multiply
   1,196.80x = 1,796.38 × 980
4. Step 4: Simplify right side
   1,196.80x = 1,760,452.40
5. Step 5: Solve for x
   x = 1,760,452.40/1,196.80
6. Step 6: Final answer
   x = 1,470.97