Finding the Fourth Proportional to 1,422, 1,962.36 and 1,008.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422 : 1,962.36 = 1,008.72 : x
2. Step 2: Convert to fraction form
   1,422/1,962.36 = 1,008.72/x
3. Step 3: Cross multiply
   1,422x = 1,962.36 × 1,008.72
4. Step 4: Simplify right side
   1,422x = 1,979,471.78
5. Step 5: Solve for x
   x = 1,979,471.78/1,422
6. Step 6: Final answer
   x = 1,392.03