Finding the Fourth Proportional to 1,578.31, 2,367.69 and 756.43

Step by Step Solution

1. Step 1: Write the proportion equation
   1,578.31 : 2,367.69 = 756.43 : x
2. Step 2: Convert to fraction form
   1,578.31/2,367.69 = 756.43/x
3. Step 3: Cross multiply
   1,578.31x = 2,367.69 × 756.43
4. Step 4: Simplify right side
   1,578.31x = 1,790,979.91
5. Step 5: Solve for x
   x = 1,790,979.91/1,578.31
6. Step 6: Final answer
   x = 1,134.75