Finding the Fourth Proportional to 1,383.79, 2,076.98 and 921.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,383.79 : 2,076.98 = 921.89 : x
2. Step 2: Convert to fraction form
   1,383.79/2,076.98 = 921.89/x
3. Step 3: Cross multiply
   1,383.79x = 2,076.98 × 921.89
4. Step 4: Simplify right side
   1,383.79x = 1,914,754.59
5. Step 5: Solve for x
   x = 1,914,754.59/1,383.79
6. Step 6: Final answer
   x = 1,383.71