Finding the Fourth Proportional to 1,383.12, 2,076.12 and 890.16

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.12 : 2,076.12 = 890.16 : x
2. Step 2: Convert to fraction form
   1,383.12/2,076.12 = 890.16/x
3. Step 3: Cross multiply
   1,383.12x = 2,076.12 × 890.16
4. Step 4: Simplify right side
   1,383.12x = 1,848,078.98
5. Step 5: Solve for x
   x = 1,848,078.98/1,383.12
6. Step 6: Final answer
   x = 1,336.17