Finding the Fourth Proportional to 1,297.58, 1,790.69 and 708.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,297.58 : 1,790.69 = 708.15 : x
2. Step 2: Convert to fraction form
   1,297.58/1,790.69 = 708.15/x
3. Step 3: Cross multiply
   1,297.58x = 1,790.69 × 708.15
4. Step 4: Simplify right side
   1,297.58x = 1,268,073.58
5. Step 5: Solve for x
   x = 1,268,073.58/1,297.58
6. Step 6: Final answer
   x = 977.26