Finding the Fourth Proportional to 1,230.72, 1,698.24 and 758.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,230.72 : 1,698.24 = 758.72 : x
2. Step 2: Convert to fraction form
   1,230.72/1,698.24 = 758.72/x
3. Step 3: Cross multiply
   1,230.72x = 1,698.24 × 758.72
4. Step 4: Simplify right side
   1,230.72x = 1,288,488.65
5. Step 5: Solve for x
   x = 1,288,488.65/1,230.72
6. Step 6: Final answer
   x = 1,046.94