Finding the Fourth Proportional to 1,728.96, 2,386.10 and 983.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,728.96 : 2,386.10 = 983.15 : x
2. Step 2: Convert to fraction form
   1,728.96/2,386.10 = 983.15/x
3. Step 3: Cross multiply
   1,728.96x = 2,386.10 × 983.15
4. Step 4: Simplify right side
   1,728.96x = 2,345,894.22
5. Step 5: Solve for x
   x = 2,345,894.22/1,728.96
6. Step 6: Final answer
   x = 1,356.82