Finding the Fourth Proportional to 1,422.06, 1,962.18 and 979.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.06 : 1,962.18 = 979.80 : x
2. Step 2: Convert to fraction form
   1,422.06/1,962.18 = 979.80/x
3. Step 3: Cross multiply
   1,422.06x = 1,962.18 × 979.80
4. Step 4: Simplify right side
   1,422.06x = 1,922,543.96
5. Step 5: Solve for x
   x = 1,922,543.96/1,422.06
6. Step 6: Final answer
   x = 1,351.94