Finding the Fourth Proportional to 1,422.28, 1,962.30 and 956.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.28 : 1,962.30 = 956.80 : x
2. Step 2: Convert to fraction form
   1,422.28/1,962.30 = 956.80/x
3. Step 3: Cross multiply
   1,422.28x = 1,962.30 × 956.80
4. Step 4: Simplify right side
   1,422.28x = 1,877,528.64
5. Step 5: Solve for x
   x = 1,877,528.64/1,422.28
6. Step 6: Final answer
   x = 1,320.08