Finding the Fourth Proportional to 1,297.88, 1,790.88 and 800.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,297.88 : 1,790.88 = 800.72 : x
2. Step 2: Convert to fraction form
   1,297.88/1,790.88 = 800.72/x
3. Step 3: Cross multiply
   1,297.88x = 1,790.88 × 800.72
4. Step 4: Simplify right side
   1,297.88x = 1,433,993.43
5. Step 5: Solve for x
   x = 1,433,993.43/1,297.88
6. Step 6: Final answer
   x = 1,104.87