Finding the Fourth Proportional to 1,422.91, 1,962.86 and 980.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.91 : 1,962.86 = 980.05 : x
2. Step 2: Convert to fraction form
   1,422.91/1,962.86 = 980.05/x
3. Step 3: Cross multiply
   1,422.91x = 1,962.86 × 980.05
4. Step 4: Simplify right side
   1,422.91x = 1,923,700.94
5. Step 5: Solve for x
   x = 1,923,700.94/1,422.91
6. Step 6: Final answer
   x = 1,351.95