Finding the Fourth Proportional to 1,422.15, 1,962.05 and 801.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,422.15 : 1,962.05 = 801.15 : x
2. Step 2: Convert to fraction form
   1,422.15/1,962.05 = 801.15/x
3. Step 3: Cross multiply
   1,422.15x = 1,962.05 × 801.15
4. Step 4: Simplify right side
   1,422.15x = 1,571,896.36
5. Step 5: Solve for x
   x = 1,571,896.36/1,422.15
6. Step 6: Final answer
   x = 1,105.30