Finding the Fourth Proportional to 1,422.74, 2,131.94 and 958.80

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.74 : 2,131.94 = 958.80 : x
2. Step 2: Convert to fraction form
   1,422.74/2,131.94 = 958.80/x
3. Step 3: Cross multiply
   1,422.74x = 2,131.94 × 958.80
4. Step 4: Simplify right side
   1,422.74x = 2,044,099.28
5. Step 5: Solve for x
   x = 2,044,099.28/1,422.74
6. Step 6: Final answer
   x = 1,436.74