Finding the Fourth Proportional to 1,298.43, 1,791.78 and 708.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,298.43 : 1,791.78 = 708.96 : x
2. Step 2: Convert to fraction form
   1,298.43/1,791.78 = 708.96/x
3. Step 3: Cross multiply
   1,298.43x = 1,791.78 × 708.96
4. Step 4: Simplify right side
   1,298.43x = 1,270,300.35
5. Step 5: Solve for x
   x = 1,270,300.35/1,298.43
6. Step 6: Final answer
   x = 978.34