Finding the Fourth Proportional to 1,422.78, 1,963.38 and 801.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.78 : 1,963.38 = 801.78 : x
2. Step 2: Convert to fraction form
   1,422.78/1,963.38 = 801.78/x
3. Step 3: Cross multiply
   1,422.78x = 1,963.38 × 801.78
4. Step 4: Simplify right side
   1,422.78x = 1,574,198.82
5. Step 5: Solve for x
   x = 1,574,198.82/1,422.78
6. Step 6: Final answer
   x = 1,106.42