Finding the Fourth Proportional to 1,387.85, 1,915.24 and 758.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,387.85 : 1,915.24 = 758.37 : x
2. Step 2: Convert to fraction form
   1,387.85/1,915.24 = 758.37/x
3. Step 3: Cross multiply
   1,387.85x = 1,915.24 × 758.37
4. Step 4: Simplify right side
   1,387.85x = 1,452,456.49
5. Step 5: Solve for x
   x = 1,452,456.49/1,387.85
6. Step 6: Final answer
   x = 1,046.55