Finding the Fourth Proportional to 1,286.02, 1,774.72 and 754.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,286.02 : 1,774.72 = 754.78 : x
2. Step 2: Convert to fraction form
   1,286.02/1,774.72 = 754.78/x
3. Step 3: Cross multiply
   1,286.02x = 1,774.72 × 754.78
4. Step 4: Simplify right side
   1,286.02x = 1,339,523.16
5. Step 5: Solve for x
   x = 1,339,523.16/1,286.02
6. Step 6: Final answer
   x = 1,041.60