Finding the Fourth Proportional to 1,358.69, 1,874.96 and 769.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,358.69 : 1,874.96 = 769.21 : x
2. Step 2: Convert to fraction form
   1,358.69/1,874.96 = 769.21/x
3. Step 3: Cross multiply
   1,358.69x = 1,874.96 × 769.21
4. Step 4: Simplify right side
   1,358.69x = 1,442,229.45
5. Step 5: Solve for x
   x = 1,442,229.45/1,358.69
6. Step 6: Final answer
   x = 1,061.49