Finding the Fourth Proportional to 1,280.58, 1,767.57 and 749.91

Step by Step Solution

1. Step 1: Write the proportion equation
   1,280.58 : 1,767.57 = 749.91 : x
2. Step 2: Convert to fraction form
   1,280.58/1,767.57 = 749.91/x
3. Step 3: Cross multiply
   1,280.58x = 1,767.57 × 749.91
4. Step 4: Simplify right side
   1,280.58x = 1,325,518.42
5. Step 5: Solve for x
   x = 1,325,518.42/1,280.58
6. Step 6: Final answer
   x = 1,035.09