Finding the Fourth Proportional to 1,422.72, 1,962.61 and 979.86

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.72 : 1,962.61 = 979.86 : x
2. Step 2: Convert to fraction form
   1,422.72/1,962.61 = 979.86/x
3. Step 3: Cross multiply
   1,422.72x = 1,962.61 × 979.86
4. Step 4: Simplify right side
   1,422.72x = 1,923,083.03
5. Step 5: Solve for x
   x = 1,923,083.03/1,422.72
6. Step 6: Final answer
   x = 1,351.69