Finding the Fourth Proportional to 1,297.59, 1,790.70 and 708.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,297.59 : 1,790.70 = 708.15 : x
2. Step 2: Convert to fraction form
   1,297.59/1,790.70 = 708.15/x
3. Step 3: Cross multiply
   1,297.59x = 1,790.70 × 708.15
4. Step 4: Simplify right side
   1,297.59x = 1,268,084.21
5. Step 5: Solve for x
   x = 1,268,084.21/1,297.59
6. Step 6: Final answer
   x = 977.26