Finding the Fourth Proportional to 1,422.97, 1,965.54 and 980.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.97 : 1,965.54 = 980.09 : x
2. Step 2: Convert to fraction form
   1,422.97/1,965.54 = 980.09/x
3. Step 3: Cross multiply
   1,422.97x = 1,965.54 × 980.09
4. Step 4: Simplify right side
   1,422.97x = 1,926,406.10
5. Step 5: Solve for x
   x = 1,926,406.10/1,422.97
6. Step 6: Final answer
   x = 1,353.79