Finding the Fourth Proportional to 1,396.32, 1,922.68 and 1,209.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.32 : 1,922.68 = 1,209.82 : x
2. Step 2: Convert to fraction form
   1,396.32/1,922.68 = 1,209.82/x
3. Step 3: Cross multiply
   1,396.32x = 1,922.68 × 1,209.82
4. Step 4: Simplify right side
   1,396.32x = 2,326,096.72
5. Step 5: Solve for x
   x = 2,326,096.72/1,396.32
6. Step 6: Final answer
   x = 1,665.88