Finding the Fourth Proportional to 1,396.33, 1,922.09 and 1,207.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.33 : 1,922.09 = 1,207.18 : x
2. Step 2: Convert to fraction form
   1,396.33/1,922.09 = 1,207.18/x
3. Step 3: Cross multiply
   1,396.33x = 1,922.09 × 1,207.18
4. Step 4: Simplify right side
   1,396.33x = 2,320,308.61
5. Step 5: Solve for x
   x = 2,320,308.61/1,396.33
6. Step 6: Final answer
   x = 1,661.72