Finding the Fourth Proportional to 1,422.27, 1,961.60 and 980.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.27 : 1,961.60 = 980.07 : x
2. Step 2: Convert to fraction form
   1,422.27/1,961.60 = 980.07/x
3. Step 3: Cross multiply
   1,422.27x = 1,961.60 × 980.07
4. Step 4: Simplify right side
   1,422.27x = 1,922,500.41
5. Step 5: Solve for x
   x = 1,922,500.41/1,422.27
6. Step 6: Final answer
   x = 1,351.71