Finding the Fourth Proportional to 1,321.38, 1,983.29 and 705.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,321.38 : 1,983.29 = 705.78 : x
2. Step 2: Convert to fraction form
   1,321.38/1,983.29 = 705.78/x
3. Step 3: Cross multiply
   1,321.38x = 1,983.29 × 705.78
4. Step 4: Simplify right side
   1,321.38x = 1,399,762.89
5. Step 5: Solve for x
   x = 1,399,762.89/1,321.38
6. Step 6: Final answer
   x = 1,059.32