Finding the Fourth Proportional to 1,382.72, 2,076.12 and 923.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,382.72 : 2,076.12 = 923.36 : x
2. Step 2: Convert to fraction form
   1,382.72/2,076.12 = 923.36/x
3. Step 3: Cross multiply
   1,382.72x = 2,076.12 × 923.36
4. Step 4: Simplify right side
   1,382.72x = 1,917,006.16
5. Step 5: Solve for x
   x = 1,917,006.16/1,382.72
6. Step 6: Final answer
   x = 1,386.40