Finding the Fourth Proportional to 1,392.09, 2,086.88 and 1,082.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,392.09 : 2,086.88 = 1,082.25 : x
2. Step 2: Convert to fraction form
   1,392.09/2,086.88 = 1,082.25/x
3. Step 3: Cross multiply
   1,392.09x = 2,086.88 × 1,082.25
4. Step 4: Simplify right side
   1,392.09x = 2,258,520.47
5. Step 5: Solve for x
   x = 2,258,520.47/1,392.09
6. Step 6: Final answer
   x = 1,622.40